How to Remove Scratches from a High Gloss Black Piano - Polyester Finish
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- Опубликовано: 2 июл 2024
- Fine Piano Tuning and Restoration
FinePianoTuning.net
00:00 Introduction
00:25 Disassembly
00:56 Step 1 600 grit with a block
02:10 Step 2 600 grit Random Orbit
03:30 Step 3 1000 grit In-line sander
06:03 Step 4 2000 grit In-line sander
07:30 Step 5 4000 grit Rotary polisher
08:53 Step 6 Buff with edge buffer
10:30 Step 7 Polish with rotary polishing pad
12:10 Final Result
12:30 Bonus Footage 
Хобби
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Thanks Jacob for your humility in sharing this. I am a own piano shop and have been restoring for 35 years and just love your attention to detail
Awesome!
Fascinating. I came here to see what’s involved in repairing scratches before I buy a high gloss black piano. Not a repair for the average person I see. Thank you for lovingly repairing pianos!
Thanks for your video, i am new to piano technician, this is big help
I hold the flanel buffing wheel just like you. I never knew it was backwards...hahaha. But thanks for the video and your honesty. This is an inglorious work, laborious and for the perfectionists, a challenge. I appreciate your work - very, very nice!
I've done some of this work and I had to see why u do it your way.
You've given me some new ideas. (I also learned to stop at 1200 and then use menzerna apo #1 and then apo #2. Maybe your way takes longer but the results are probably superior).
Thank u!
Love your videos, I’m a tech and I’m always looking to expand my skills. Especially with polyester finishes
Awesome!
Hello Jacob, thanks a lot for sharing your knowledge. I Work as a volunteer at a small theather in the neterlands and we were discussing how to revive our black piano. I think we will just clean it thorougly and forget about the scratch removing all together after seing this....greets, Paul.
Just bought a 1943 Baldwin M. Gloss Black finish and it is in desperate need of being addressed. This video is terrific. It offers hope outside of spending the 30K to have the entire piano rebuilt and refinished. Thanks.
Unless it’s been refinished in the past, your Baldwin is likely nitrocellulose lacquer, not polyester. Take a picture and send it to polyesterrepair at gmail and I can tell you what it is.
You’ll likely need to find a refinisher :/
Very helpful video, thanks! I am a piano technician planning to do some refinishing work in the future.
Great to hear!
Good job Jacob. We have spoke before about questions i have on repairs here in southwest Virginia
Hi Richard, I’m glad you were able to fix it without too much hassle!
Great video! I always enjoy the videos you put out.
I am a piano technician and I also do polyester finish repair.
Someday maybe I will get a bigger air compressor and get a nice used inline sander like yours 🙂
Thank you for putting in all the work it takes to make these videos!
Cheers!
Piano refinishing and need to learn how to polish high gloss polyester, just to a polyester class an didn't learn much about polishing. Thank you
Excellent. Where was the class?
thanks for a great video. My piano is black french polish shellac so it would be great if you could explain process for this finish
Piano tech here also and interested in doing finish repairs in the future 👋
My Yamaha piano became scratched in house move . How can I cover the scratches
Hello Jacob, I came across your you tube channel googling piano, I'm learning piano with a digital piano but would love an acoustic piano one day
I did one these few months back a full restore it was painful sanding the whole thing back
I own a concert grand from 1966, refinished in black French polish. Since I bought this piano, I've wanted to refinish it with polyester but it's very difficult to find information about polyester. Thank you for sharing your knowledge.
Awesome! I know there are places in Europe that can refinish in polyester, but I don't know of any companies here in the States that do that. (Complete refinishing vs. repairs or polishing)
@@JacobEmch91 Yes, exactly my hurdle.
Hi Jacob
Thank you for your sharing. I just reach your channel by chance. I just want to have some idea about piano finishing restoration techniques.
I'm a Tech and Refinisher, my current task is to polish polyester that I have been applied to a small grand. I begin by sanding the surface from 180/220 up to 1500 and then use green and white polishing bar compounds with a buffing wheel. Next, I utilize an orbital random polisher with Mercena 3 in 1 on a "URO fiber pad," followed by a foam pad. Although this method works well, I could further refine the finish by using a finer foam pad and 3M ultra-fine polisher swirl remover. However, I encounter difficulties when it comes to polishing the lyre and music desk frame as there are corners that are hard to reach.
I also utilize a combination of orbital and Straight Line Air Sanders, although my sander may differ from yours, they both perform similarly. I use 3M CUBITRON II NET ABRASIVES designed for this type of sander. However, I have been struggling to avoid visible pigtail marks caused by Abranet 600 when sanding with grits higher than 1000. I find myself concerned everytime that the orbital sander may leave pigtail marks,
Whats the brand and model of your line sander?
Very interesting. I’ll have to give a few of those a try. Thank you for your insight!
I’ve also noticed when sanding past 600 with abranet, the pigtails. I used to sand with 1000 dry abranet, then have to sand with wet abralon 1000 grit again, to remove the pigtails. It was just a step that I knew I had to do. I’ve also learned to continuously remove and blow the dust out of the sanding disc.
This is a stuhr 1/2” inline sander.
There are others that I’m sure work just as well or better.
Thanks for the info. We own a piano store
Thanks for all the helpful videos. I have a problem with preparing a mixture of polyester resin and hardener. In its structure, after hardening, bubbles are revealed during grinding. How can this be avoided?
The thicker the fill, the more bubbles you will get. Try layering a few thins coats successively, as the prior coat begins to gel, but before it’s fully cured, paint on another coat. Do this a few times until you get your thickness.
Best to mix up a big batch, say 20mL, add 24 drops of color, mix well, divvy into 4-5 cups and add hardener just before you need each fill/coat/layer
Great video! Quick question - where do you find those loose canton-flannel wheels for your polisher?
Thanks! Jescar sells them. and Allied piano.
Hi, thanks for the video i repair digital pianos and i have a hp103 Roland which in its specs lists it as a "simulated polished ebony" finish that is fairly scratched up from the previous owner, i am not sure if its polyester but i will try find out before i attempt to make it look a little nicer. I have no idea what simulated polished ebony is? Thanks for sharing your techniques . Best Regards
I made the mistake once of trying to repair one of those for a customer. One of the few times I didn’t get paid haha. The finish reminded me of black electrical tape, just shinier. Once I hit it with sand paper, it simply wouldn’t buff out.
@@JacobEmch91 yes I agree I have a feeling it's just like a stick on finish, I think I will only hit it with the buffer. Thanks for the advice. Best Regards Tim
Hello Jacob. 15:04
Do you know where I can find the large wheel you use with your polisher? Thank you
Alliedpiano.com or jescar
You want loose canton flannel
Hello Jacob, im a piano tech up in alaska on the kenai peninsula. Excellent job on the video! So very helpful. I was wondering where your located? I was curious what epoxy use generally use when making major repairs like a broken corner on a grand piano lid? Actually im full of questions for you, perhaps another time though😊 thanks again for the video👍🏻 Robbie- peninsula piano repair
Kasilof Alaska
Thanks Robbie! I am a little over an hour outside of Chicago, in northern Indiana. If you haven’t already, check out alliedpiano.com for materials and a 52 page instruction booklet. They used to have instructional videos on their site, too, not sure if they still do.
I also have a video I posted a couple years ago, repairing a larger damage to the edge of a piano lid, so you might check that out. I don’t use liquid epoxy, but sometimes epoxy putty to fill in larger gouges.
It was a long journey for me to be able to make a repair look even “acceptable” haha
Hi Jacob,when you use the auto polish on the final run what pad do you use?
It’s a lighter density foam pad.
What’s the size and type of cotton wheel you use? Did you get it at Allied?
(4) 1/2” wide 10” diameter canton flannel wheels stacked. Either allied or Jescar. If you don’t already have the adapter for your polisher, allied sells it.
What about removing deeper white scratches from polyester? Do they have to be filled?
It will probably have to be filled and repaired 😓
Wow great work! Curious to know what I would have to pay to get that work done?
Thanks! In my case, an hourly shop rate plus supplies. Not sure what others would charge in your area.
I’m a piano tech here in VA……I would love to see a video of your techniques on lacquer finishes. I just finished a walnut M circa 1927 and got the finish down to a 0000 traditional patina…but would love to see the finish with a higher gloss so the grain pops out more. Got anything to show for something like that?
Hi Terry, you can start by taking 50/50 polish (any final automotive polish) and water, mix it well together, squirt a line of it on a clean terry towel, dab it into the towel, and (with a block) rub in the direction of your steel wool lines. You will have to reapply polish often. Follow up with a clean microfiber. That will give you a “satin luster,” as long as you sanded away the orange peel before steel wool-ing.
I don’t like to take nitro lacquer up to high gloss.
Take a look at the end of this video- but it might not be what you’re going for.
ruclips.net/video/DtMk4bKfEi8/видео.html
@@JacobEmch91 Hello
I just polished a black gloss lacquer steinway by hand but I had fine grain lines that I couldnt get out. It looks good from 6 ft away but up close you can see the fine lines.
The owner thinks it was resprayed at some time in it's past.
Satin luster is of course normal.
Great Video Jacob! I'm new to this and am working on pretty much the same thing as we speak. I would love to have that wet sander. What brand of wet sander is that? Thanks
Just a 6” random orbit. At one point I use the rotary polisher to wet sand. Use mesh sanding pads made for wet sanding
I’m sorry, maybe you’re referring to the inline sander. They don’t make the dual-pad sanders like this new anymore unfortunately. Check eBay or the used market. Hazard Fraught- I mean- Harbor Freight has regular inline/straight sanders
I think the brand is Stuhr
@@JacobEmch91 Thanks Jacob, Hazard Fraught is about right :) Do you know of a company that sells the Flannel Buffing pads also? I would like to get one for our 8 inch buffer. Thanks again you've been a huge help!!
Dave
@@user-hf6zm9pb2l alliedpiano.com has some or check guitar finishing sites
Please tell me where I can buy such a square Grinding machine Thanks
Just search for a “straight-line” or “in line” sander
@@JacobEmch91 Be so kind to send me a particular link where to buy? Exactley like yours one.
Thanks
@@user-yp7kd8mv2z like I said in the video, they don’t make those new anymore.
Can you tell us what in-line sander you're using?
A stuhr 1000f 1/2” dual pad inline sander. Like I said you can’t buy them new. There are other brands that I’m sure work just as well or better. A 3/4” stroke is probably faster but more $$$
@@JacobEmch91 I am both a technician & a refinisher, actually I'm a cabinet maker by trade but I also refinish old pianos. I don't usually work on piano actions (although I have on occasion) mostly I restore soundboards and damaged cases. My current efforts are aimed at restoring a 1921 Christman Studio Grand.
Your videos are very informative and helpful, I often watch the same video several times, as there is so much useful information that it's hard to catch it all in a single viewing. Thank you for doing what you do, you have convinced me not to mess with polyester finishes.
Neat! It’s cool how the different trades line up. Good decision staying away from polyester. Haha