Understanding Marine Sealants
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- Опубликовано: 27 янв 2015
- Understanding the properties of sealants will help you select the right sealant for the application. Myths and miss information are common on the docks so in this video I explain the differences and facts about common sealants.
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For a text version please visit my web sire www.projectboatzen.com 
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You're really good at this. It's so rare to find this breadth of information in such a concise explanation. Eight years later, this video is still fantastic.
Thanks glad it was helpful
Wow your script/writing is very well worded. This is one of the best videos on the subject. Thank you for taking the time and effort to share your knowledge and understanding.
Glad you liked it and thanks for the feedback
been watching sailing videos for a long time and this guys provides real credible advise
pgreenx Thanks glad you found something useful here
Came across this video just in time before I applied the wrong silicone/sealant to re-caulk a recessed rod rack to the fiberglass inwale. Nice pace to the video, and was very informative with easy to understand basic chemistry info in order for me to choose the correct sealant. I will be seeking out more Captain Wayne Canning videos in the future. Thank you for saving me time making sense of the silicone & sealant debate.
+Mary Paine Thanks for the comments, glad the video was of help to you. Good luck with your project
Very helpful captain thank you filling screw holes And covering the edges of cut holes in my boat above deck based on the information you gave me marine grade silicone seems to be the best application. This is what I've been using what would be your most recently priced brand these applications thank you very much have a blessed day
Sikaflex 291 is my go-to for seaming, bedding and thru-hulls.
Sika recommend Aktivator 205 as the solvent pretreatment prior to using 291 - but no one in my neck of the woods uses it nor does any local store stock it. The 205 is not cheap & I am reluctant to buy it because I will not use much & the rest will go off before I next need it. Just wondering what you use to prep fibreglass transom?? Acetone/Thinners/Isopropryl??
Lacquer thinner or acetone. @@MrNicholsonmike
Great video! Really thorough talk, you taught me a lot I ought to know on a subject I was always too afraid to ask. :D
I need to fix a leaking forward deck hatch on my boat that was patched by a previous owner. Watching your video made me realized they'd done a bad fix with butyl. Totally makes sense that it's failed over the years due to sun/chemical cleaners, and now I know why to fix it with silicone instead.
Thanks very much!
Thanks glad it was helpful
Thank you for your video. Your video has been most informative. I thank you for your knowledge without the hype and personal opinions.
You are welcome and thanks for the feedback
Dear Capt Wayne, very informative video. I'm planning to replace my car headlight's lens as the current one has turned yellow with age. What would be the best type of sealant or silicone to use in resealing my headlight with the new lens? Any particular brand you would recommend? I do not want any condensation to form inside the headlight for a long time to come. Thanks in advance!
Wayne many thanks! I found your video to be very helpful. Hopeful in your next video you'll explain what is the best application for each of the different products.
Thanks, yeah I really have to do one on using sealants, just have to find the time to do it
Time, I understand. Time is an elusive creature.
I look forward to you efforts in the future unless you get the chance to go sailing instead.
New Subscriber here. These videos you have offer the right amount of technical information in an easy to listen to format. +1
+MrNurseinTExas Thanks for the feedback, glad you like them
Thank you, we just bought a sailboat that needs a bit of TLC, and the many types of sealants out there was overwhelming. I am just starting to get a handle on it, and this video went along way to filling the gaps in my knowledge.
Glad it was of help and thanks for the positive feedback. Good luck with your project.
This is amazing! Thank you!
Very informative.. I'm curious about epoxies for plastic? How do they compare with silicone and polyutherante?
Would 5200 be good for aluminum fishing boat? I got some leaks from rivets I cannot get at to tighten and a hair line crack. Was planning on sandwich a piece of 1/8" aluminum with 5200 and use marine rivets on the tiny crack.
Very informative and useful. Thanks for posting this.
glad it was helpful and thanks for the comment
What do you recommend for resealing the glass round windows on a boat? Need to clean the old sealant around the fixes windows/glass and reseal?
Was also going to Use acetone to get things clean prior to the new sealant, I would think is ok. ? Elbow grease with a light rag.
Very informative video. Very well explained and understood, thumps up from Goa, India
Thanks glad you liked it
i was going to thru bolt a jet ski and jon boat together. what would be the best sealent to use in your opinion?
Just scrolled through some of your videos.... Great channel!
Glad you like them!
Thank you for the information Capt. Wayne! I was going to use 3M 5200 to seal up my plastic kayak's bulkheads but it seems I was misinformed as a high quality silicone will do the job better!
If the Kayak is a poly material silicone would be best. Thanks good luck with it.
What's the best kind of sealant for sealing a screw that goes through a teak toe rail and the fiberglass underneath? My boat is short and narrow so the toerail dips into the water when cruising.
Hello, Which product would you use to seal beckson screw in access plates? Also which product would you recommend to seal the center console helm to the deck? Thanks in advance
Thanks for this wonderful explaination.
Could you please recommend sealant and top coating for wooden water basin / sink installed in bathroom. Please.
Polysulfide works well with wood and should have good resistance to cleaners.
What’s the best sealant for aluminum Jon boats?.... I have a fish finder I want to install but I’ve heard so many different recommendations on sealant I have no clue what to use for the mounting of my transducer .. what’s best for aluminum ?
I need to bond bailer gaskets to stainless steel housings through the hull of my sailboat. These gaskets generally last many years before replacement is an issue. What would you use to bond the gasket to the fixture. It is a Ronstan outside mount bailer.
Great video I appreciate your time and knowledge!!
Thanks
QUESTION: My Shuttle Bus/Camper is fiberglass, with two seams front and back...which leak often. RV caulk is not really for fiberglass, and there is a bit of vibration due to driving......so what caulking/sealant would you recommend? Thanks in advance for any advice.
I have to pull my fuel tank on my Grady 21’cc moved the console and t top. Also I’ll be reseal all the adhesive calk on the deck and leaning post ,,,if you wouldn’t mind sharing your knowledge and giving me the best product’s to use for those jobs that would be great.
Also I’ll be installing sea deck and painting both topside and hull
Thanks Wayne great video.
Thanks hope it was helpful
Thanks for the video, very informative. What would you recommend for a repair on the bottom of a kayak made from hdpe?
I believe 3M makes a special adhesive for that.
What would you recommend for a rub rail? I'm restoring a 1976 Bayliner Bucaneer. Major leaking from the rub rail. I have it all prepped to reinstall. I am not sure what sealant to keep the water out.
I'm looking for a sealant to prevent water leaks in the cab of my truck from my roof rack, what would be a good choice for this?
What sealant is good choice to use on drain plug under water?
Great video and information!
So, what do I need to glue PVC board or composite decking board to my fiberglass bass boat? Without being long winded, I am replacing the old seats with new ones and there is nothing behind the thin fiberglass to attach the backs too and the backs need to be offset so the live well lids can open without hitting them. I want to glue some type of composite material to the fiberglass and then through bolt the seat backs to it. This should take care of both the issue of having something to screw to and creating an offset. Otherwise I would remove the foam inside and install a backer board, but I would still need to offset the seats and the screws would need to be much longer, causing other issues. So, what adhesive? It will still be in sunlight even though it’s behind the seat and I may paint the topside and inside this winter, so preferably paintable. It’s a great functioning 1994 ProCraft 200 Super Pro, in case you’re wondering what I am destroying 🥸
Wayne in your professional opinion what product would you use to rebed stansions? Butyl tape or 3M 4000? I chose these two because they seem to be most popular. Thanks
I would use the 4000 or a polysulfide like Lifecaulk. The problem with butyl is that because it does not harden the movement of the stanchions will work it out over a period of time. What ever you use counter sink the holes to form a trough for the sealant. I also like to use Orings around the bolts as an additional seal. Good luck with it and thanks for asking.
THANK YOU for this, I've been totally confused about the options! I have a fairly specific question. Which would be best for bonding fabric to fabric then withstand pulling (i.e. the pull and weight of sitting on the fabrics slung between rods, as in a swing). It will be outside as well, but not encountering oils or grease etc.
This is really about sealants not adhesives but 5200 is a strong adhesive and would bond many fabrics. I would suggest stitching myself as this is the best way to go with what you are talking about. Thanks
great thank you! is there such a thing as a 'portable' machine to sew in place that you've ever heard of?
Wayne great video 😁....what would you recommend for a leaky 10 ft aluminum jon boat thx
Flex tape
I am preparing to remove and replace the caulk in the seams in my boats floor. It is a center console built like most others and assume the floor is fibreglass. Based on your video I was going to recaulk with the 3M 4000 UV. I just wanted to make sure that is what you'd recommend? Great video by the way. Very well done and great information.
I agree with your choice and thanks for the comments
Thanks for sharing this info! I'm looking for a sealant that's pour-able, with the best adhesion to any material, and can cure in a damp/wet environment. Any suggestions?
Try "coat-it"sold on Amazon
Excellent video, very interesting
Thanks for the video. Which would you use to seal gudgeon that sometimes goes below waterline, 3M 4000 or 4200? Also which of those would you use for chain plate covers on the deck. Boat is J22.
For the gudgeon I would use 4000 or polysulfied, for chain late butyl tape
Why couldn't you comment on polysulfide, a sealant that been around for decades on boats? Spent too much time on silicone.
I have a plastic cup holder that has started to come loose that’s recessed into the casting deck on the bow of my 2018 glasstream 17ccr. I’m assuming that the sealant used to stick these down was just a bead of silicon caulking around the cup holder? Is silicon caulk the best this to use in a repair for this application? What product would you recommend? I need a white caulk. Thanks for the video, it was super informative. You’re very knowledgeable on the topic!
Yes silicone is best with plastic
I have a sun dolphin sportsman (Polyethylene) boat. I just want run a bead to seal the strip around the clam shell. What is best to use?
Thank you for making this video! I really learned alot. I have a question though, If you had to use a sealant to repair a small crack on a pool sand filter, what would you use to try to repair the small crack? The pressure of this filter is around 25psi. Thank you!
I am guessing the filter housing is a type of plastic. I think many of these are a fiber reinforce plastic but I am an expert on those. I would think for a crack you are going to want an adhesive more than a sealant. I think you can get a 2 part epoxy for plastics that would work. I would ask at a pool store what they suggest. Hope that helps and thanks for watching.
I will try that, thank you for the advice!
Hello Captain Wayne! What a great presentation! Your information will really be useful in the future. I have a specific questions regarding the use of adhesives, I will be installing strip lighting with a 3M tape on the back side. These strips will be 12” long. I have read comments that suggest the adhesive tape wil fail and that one should use an adhesive to help support the lights underneath the rail of my fishing boat. Any suggestions as to what adhesive should be used?
3M adhesive is generally good. I would suggest starting with that. If that fails over time contact cement might be a good choice. Not sure of what you are sticking it to, like fiberglass of metal. Keep it simple and good luck
Very helpful Wayne, thanks. The keel bolts on my Thunderbird 24 were leaking a little bit of water into the keel last year. She's on the hard now and I'd like to remove the nuts and re-bed the bolts with sealant. I don't want to separate the keel at this time. Which sealant would you recommend for this application?
Polysulfide would work well for this. You really should drop the keel and clean the joint and rebed I would use 5200 for that. Good luck
I would think you need to drop the keel, ask a boatbuilder but the problem needs to be addressed some time.
3m 5200 is indicated. IT IS PERMANENT you never ever want to use it if you think you might have to drop the keel again.
I cant see how puting anything on top of the keelbolt nuts is going to do any good, you do not want any moisture getting in to the lamination/gelcoat.
I dont recal seeing any sealing on my keelblot nuts
Thanks for the useful video. I have some leaky stanchions. Which sealant would you recommend to put around the bolt holes? I was recommended 3M 4200, but that one wasn't mentioned in your video.
4200 will work. I might also suggest lightly coutersinking bolt holes and using Orings around the bolts as well. This will help as stanchion bases are subjected to flexing making them a challenge for most sealants. Good luck
Very thorough info
I use 3M Marine silicone to repair a crack on faucet sink the beak had a small rust water was coming out through a crack i sealed it with the silicone it works no more water spraying out through the crack anymore.
Glad it worked
9 Years later this info still is the best option of chooses
Thanks I may do a update based on some new sealants in the market
Great video, thank you. I am wanting to reseal the pass thru ports in my basstender. Plastic boat with plastic passthrus. It had brutal tape and silicone. I bought 5200 but now I am rethinking this choice. Any suggestions? Maybe skip the brutal and just but good quality silicone? All three ports will be underwater. Thank you, again!
Yes good quality silicone is the way to go
Anybody know the best sealant to apply underwater in the ocean on a boat hull???
I'm currently in Jupiter Florida and got a free 35 ft sailboat I'm just trying to temporarily stop the leak. It's in the hull and I'm looking for a product that maybe someone's use and had success with to dive down and apply under the salt water just to stop the leak temporarily at least or longer term.
What would adhere best? The water is dirty as it's in the intercoastal in Jupiter Florida so it's a lot of river water that is about to meet the ocean
This 10 minute video answered many of my questions I've had over the
years, thank you! I am removing and reattaching toe rails to a 1985 s2
7.9. I will be laying double beads which equal 100 ft overall. With
this amount of sealant, cost is an issue. I will probably use close to
two cases when finished. Is Boatlife (Polysulfide) the only option?
I think it is your best option. When it comes to a project like that it is best not to cut corners on material. Glad the video could help you.
Thanks Wayne. Can I use both LifeSeal and LifeCaulk?
What is the toe rail made of?
6000 series anodized alumimum
Either will do I do not have as much experience with the life seal as it is newer so I may lean to the life caulk. As a matter of fact that is what I recently used on my own alum toe rail after redoing the hull deck joint. Good luck
I’m a carpenter and I hate that vinegar smell from some silicone products. Now I know they’re inferior!! I had a feeling lol smells nasty. Cool info man 👍🏻
Glad to be of help
I'm wanting to screw in some anchor line holders into my polyethylene plastic 10 ft bass buggy boat. Is it safe for me to just screw them onto the plastic without the plastic cracking or should I use a type of silicone? I'm also making some rod holders and I'm using flanges on the base and was just wondering if it is safe to drill those directly into the boat also or if I should maybe put a piece of wood so the screw would have to go through the flange and then the wood and then the boat? Thanks for your help!
Not sure about a poly boat but I would use silicone as a sealant and back up any fasteners. I would redrill any holes as well. Hope that helps
Danny, are you expecting the anchor line holder to bear the weight of the anchor? It's tough to understand your exact need without pictures but I would definitely suggest that you use a piece of wood to "back" up to the screw mounting areas if possible to help spread out the force. Through bolting your mounting screws to a backing plate of plywood or hardwood will spread out the load and help keep the screws from stripping out under load.
Thank you!
You're welcome. Hope it was of help
I’m getting ready to install a new tilt trim motor on my boat. Even though it has a oring I also want to apply a sealant around the flange for extra sealing from salt water. Which brand and type do you recommend to use
I am thinking you are talking aluminum to aluminum so I would suggest a good quality marine silicone. Not West marine brand, 3M and boatlife have a good product. Good luck
Hello Captain Wayne, I’m replacing plastic thru hull scuppers. They are push together scuppers. I have removed the old ones, they were 19 years old, and removed adhesive and cleaned all surfaces. Bought new TH Marine Plastic scuppers, they are identical to the old ones. They are in transom area to drain the outboard motor well. I guess they are considered above the waterline. They have rubber flappers inside them. I have a 26’ single outboard Proline walk around. Can you please recommend what sealant I should use? Thank you! Alecia
Silicone when sealing plastic fittings. Good luck
Any idea what I would use for sealing rivets on an aluminum boat?
this is a little after the video but my dads aluminum boat has some pinhole leaks and i was told resin would be best option i tried rubberized spray and it still leaks....gonna try resin next....but any other suggestions?
You may want to glue a plate over the area with pinholes. Good luck
How about the marine sealant Terason 9160? It has the vinegar smell you refer to, but I was told that it's one of the best to use to keep water out on an above-water surface. Is it ok only for an indoor use? Should I be worried that it was used as a seal between fiberglass and metal? Great info in your video, thank you! I will share it with my uncle who thinks 5200 is for everything. 😬
I have not used it so cannot really say. I would say it would be best to stick with a tried and true marine sealant after all the sealant is a small cost of any repair. Thanks for the comment
most common sealant? $100 bills crammed into leaking area. Most common diesel repair? $100 bills fed directly into main air intake while running at full throttle.
Oo
Thanks, dude!!!
Glad to help!
Just in time.. have a very small leak in my Lewmar forward hatch on a 35 year old Pearson 40...the old caulk has shrunk and there is a noticeable gap between the metal frame and old caulk and the plastic and old caulk. since both hatches are currently water tight, can I just fill the gap or should I remove the old caulk and re bed the plastic? Questions for the next video... Thank You
Stephen Luta Sorry to take so long getting back to you on this. If the hatches are not leaking I would just fill the gap. I might suggest cutting some of the old caulk out and fill over the top for a more complete seal. I would use the Dow 795 or boatlife silicone for this. Yes the next video will have more info on this and how to finish the sealant so that it looks good when done as well. Thanks for watching
Installing smart tabs and need to seal old screw holes as well as the new ones for the tabs. Which sealant would be best for this.
I would do a proper fiberglass repair and fill the old holes. Only way to know they will not leak. Good luck
I would fill with a resin filler not a sealant.
Very informative
Ok I just bought the 4200 and 5200. My plan was to use 5200 on new deck cleats screws/ backing plate and 4200 on a plastic thru hull pass through clam shell that may need to be changed our for a new one at some point as well as heavy duty Metal folding Antenna mounts. Do I need silicone for the screws to mount a plastic chart plotter and clamb shell for coax? Please advise I'm getting reading to the this boat in to a surface facility for the Auxiliary and I'm starting to panic as I never worked with fiberglass and plastic
I would suggest polysulfied for bedding the cleats Silicone for plastic fittings. Do not use 5200 at all. Good luck.
joe scott buy a bronze thruhull first more durable and better looking.
Thanks Wayne. I have used all 3 of 3m 5200,4200, 4000 and mainly use correctly but sometimes not. And always seems 50:50 people debate
Would you think the 5200 would be good to use to glue the top half of a fiberglass boat back to the bottom half? The top fits down into a 3/4” lip on the bottom and gets riveted or screwed with an aluminum/rubber strip around the seam. You sit, steer and hold on to the top of the boat like a motorcycle...The boat in question is a 1969 Barracuda hydrocycle, a predecessor to seadoo that takes an outboard motor, there is a short video of it on my channel.
Wayne, I have a 1990 Marine Trader that needs to have windows rebedded. The long stateroom windows are leaking. What is best sealant caulk to use? Thanks Thom
Are the window frames wood or aluminum?
Wayne Canning aluminum frames
My gimbal housing is leaking pretty well.. I'm not wanting to remove the mercruiser v6 till winter.. what type of sealant will be good for the housing between prop and motor?
Not sure right off but I would guess the only real way to repair that is to remove and re-seal. I know neer an easy way sorry to say
Hello, What would you recommend for plastic and rubber for underwater ? I have Marine 3M 5200 Adhesive or Marine Silicone.. it’s to glue fins on my kayak!! Thanks
You will likely need a special adhesive for the type of plastic your kayak is made of. Check some of the 3M adhesives for ABS plastic
Nice job god bless
Well done Wayne ;-)
BoatworksToday Thanks I enjoyed your channel as well and will add a link to it
What’s the best adhesive or sealant for transom housing on a jet boat with a Berkeley or Jacuzzi jet drive?
Polysulfide
Redoing a wooden lapstrake. What do you recommend to use as an extra measure against leaks. Thanks
Polysulfide such as BoatLife is a good choice for wood. Good luck
@@Boatingzen Thanks.
What do you use for a hole that’s been patched up (maybe the right way ) in your boat that you just bought. 87 Thunder Craft.
Epoxy
This would depend and I would need more information to answer that
I used marine loctite and I messed an area up. Before I try anything do you have a tip on how to remove it? A heat gun or any solutions???
Normally I use a sharp chisel to cut and scrape off the sealant. Good luck
I was expecting to see some of the Sikaflex products in this line up. Any specific reason they are excluded?
Not really. They are similar
I just used some silicone for my scupper pipes, now i need to replace my drain plug. If i use 4200 will i be able to remove it later? How to? Thank you
I might suggest polysulfied for that
I am looking for a sealant that would be extremely resistant to mould and mildew. Which would you recommend? Thanks
Part of that depends on the application but if using silicone make sure the label says it is mildew resistant as silicone seems to be the worst for mold growth. Good luck
@@Boatingzen I want it for the bathroom but mildew resistant silicone sealants always seem to succumb to mildew in the end.
Best sealant for bedding aluminum bomar hatch to a deck made of expanded celtec pvc?
I would use a good quality silicone Boatlife makes a good one Dow 795 is good as well. Good luck
I am going to go with a good quality marine silicone as you are bedding to plastic and aluminum
What is the best sealant for transom bolts on an aluminum transom?
I would suggest 3M 4200 or Boatlife Polysulfide.
What should i use to reseal glass windows on the top of the cabin?
A goos quality silicone is usually best for this. Do not skip buy the good stuff, Boat life or Dow 795 are best. Good luck and thanks for the comments
Do you think the 3M 5200 would be good for a inflatable boat? I would like to seal my boat. It is PVC with a aluminum hull
I have tried this with mixed results. If you try it lightly sand the surface first. Good luck
Thx, 👍 good job
Thanks
Excellent....
Thanks
What is the best product for fixing a metal gas tank with very small crack in tank.
Replace the tank. Gasoline is not something to have leaking on a boat. For a car or other application where fumes are not an issue there are some good epoxies that might work
Hi Wayne, Thanks for your kind reply. The hairline crack I have is on a car's gas tank and it is so small you can barely get your finger nail in it so thought you might know of a brand and type and where I can get it. I had someone unconfirmed tell me that Marine tex grey would work but don't know for sure. Please help
Marine tex is good and you could give it a try.
Need to seal my keel shield. What should I use?
Not sure what a keel shield is what materials are you working with?
One thought comes to mind regarding "misinformation" it works both ways.Sometimes a product is not used properly (not cleaning the surfaces) then the user blames that product.
Yes you are correct and I plan a follow up to this one on how to use sealants so keep an eye out for that one soon. Thanks again for the feedback
@@Boatingzen Did you ever make the follow up video?? I hope so 🙂
Will a polyurethane sealant adhere to a wood surface?
Yes very aggressively.
How to refresh a fresh water tank on a boat
Best product to patch my PVC inflatable dinghy?
This is a tough one I would check with the manufacture or a place that specializes in RIB repair. I really need to do a video on adhesives when I get time. Thanks
Yess
Thanks
I tried something I seen on a video and it works . You can add cornstarch to 100% clear silicone and what ever color you want add food coloring and the cornstarch sets the silicone up quicker ands evenly
I can think of a few reasons not to do this for boat silicone. The biggest being that it would likely add to mold and mildew problems with the sealant. Interesting thought though. Thanks for watching and the comments.
Whats good for triumph boats?
It is more what application than brand boat
Triumph is LDPE...hard to find a sealant that sticks to LDPE
How do you remove residue from silicone caulk
Generally I get as much as possible with a sharp chisel, then a scotch pad and finally clean with lacquer thinner.
Old video although informative. Thank you Capt Wayne. I will be replacing my 1973 Morgan rubrail with super glue!! Just kidding. Thanks again 😁
Glad to help