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got mine bubbling away outside right now lol

As a bonus he got a nice 90s splatter paint job.

Where is the removing of the seat post?

That was VERY RISKY shaking /opening the bottle like that those goggles wouldn't help much ....

A good idea that would make for easy work as long as you could isolate all of the fluid in the seat tube. What I could not overcome was how to stop all leaking into adjacent tubes and out of the frame itself. I used uninflated balloons stretched over either side of the BB shell which worked really well. It ran through the holes for the BB cable guide which I successfully plugged with chopsticks. Great. But then it found its way out the chain stays at the dropouts and out the headset, out the stem. Everything is open inside the frame to some degree. Then I flipped the frame, plugged the top of the seat tube and tried filling through the BB shell. Ultimately the same problem. It ended up getting so messy (and dangerous) that I had to stop. If it was just a matter of plugging the BB shell and fill the seat tube it would be a certain fix for all bikes. But you must have a bike with isolated tubing? I can't emphasize enough how gnarly this stuff is. Extreme caution required.

It's important to say that ALL vestiges of the caustic soda must be cleaned out of the seat tube before fitting your new seatpost. If you don't do this, the remnants of the old caustic soda will soon make the new post corrode into the seat tube. It happened to me!

What effect would the cosmic soda have on a carbon fibre frame

I once had an aluminium paint spray pot and I thought it was a good idea to clean it with a caustic soda mix, so I put it on the floor in the garage and came back after a couple of hours and all that was left of the post was the rim and a small part of the top end.

I was expecting a volcano type explosion of caustic soda anytime. Please, if you attempt this, find a way to not loose your face. A weaker solution over a longer time comes to my mind.

or. water in , pour it out to measure how much soda needed , two thirds back in , add soda into frame . or , weaker solution longer time safer . unless ppl come to it when our gone .

I'm on step 4 to remove a stuck aluminum post, if it doesn't work, I now have a step 5. XD

Hi, thank you for the valuable insight! It's good of you to put more information out there. I'm curious, how does this shoe handle moisture? Does it keep the interior dry in wet conditions? On the flip side, do you find sweat building up inside during your runs?

Interesting, but messy stuff! Was just proving it could be done, or did you actually use the bike frame after that?

If the aluminum seatpost and aluminum frame are stuck, how do you remove it?

Aahhh-Hahaha 🤣🤣 omg idiots do science.

An old skool approach to health and safety .... I love it !

So not a good idea for corrosion on vintage Campagnolo chainring then ?? Good job I checked 😲😀

Hi mate, I want to try this however by bottom bracket is also seized and im not sure how i can block off the bottom of the seat tube without removing it. I could try removing it with caustic soda too however one side is steel and ive tried my best on removing both cups however they wont budge

How long ??

Mmmmmmm, Soda.

“Some chemical reaction is taking placre...” that is an understatement....the whole bicyclre is getting cooked not only that you guys are breathing all the fumes...is that how you guys do things in ...wherever you come from?

The reaction is so violent it vaporizes the water, which is carrying the hydroxide ions. That's why the fumes are noxious, you're sniffing real basic vape.

Any left over spray it on your weeds kill them off. I was 2 hour removing a seat post last week WD40 did the job

Wow, I know it's been years since this was uploaded, but holy shit what a scary set of choices surrounding super-dangerous chemicals.

When I tried this it just filled up the rest of the bike and not the tube with the seat post :s

I,ve found a bottle of spirits of salt in the shed. Will this work as well or better?

idiots... delete that trash... you showed everything what can be done wrong and kids watch this shit

will it ruin the paint?

I had to do this on a tandem. Both seatposts were deep and completely stuck. It didn't hurt the paint, just ate up the aluminum.

Shaking the bottle into direction of face. Hmm

I try it but i used caustic soda flakes and its is to hard to dissolve or i just wait it to dissolve the aluminum

get a new frame and throw away that shitty piece of junk

Wtf ? I put mine upside down in a vice and twisted the bike worked a treat but I am more physics than chemistry

how did you seal the bottom bracket?

Always wondered how they made Thomas the Tank Engine's steam!

But did the weeds on your terrace survive?

just pee down the tube

I have stuck aluminium seatpost in carbon frame. if i will use your method in carbon frame will it work? Or sodium will damage carbon? Will i need to do something after reaction will end like to clean parts of alluminium from frame? Thank you

did you coat the inside of the frame with anything after flushing all of the caustic soda out with water?

I had the same issue, all of Sheldon Brown's home remedies failed me as did the Internet's wisdom, so I made the Seatpost Extractor. www.seatpostextractor.com

I just did this for the 1st time on a 1950s racing frame and it works. Took about 5 refills over the course of a few days - leaving it overnight. It takes off paint as well.

If them fumes aint Noxious why the hell are you coughing , what a loon.

Have a six pack of beer with you while doing this. Not to drink, but to splash on your body that might get hit with that caustic soda mix. Caustic soda will burn your skin very very quickly but the beer is at the opposite end of the pH scale (beer is somwewhat acidic) and will neutralize the nasty caustic and just might save your skin. Of course, any beer left over after finishing this project can then be consumed in celebration!!

Gormlous idiot ar work, putting caustic into a bottle with a tiny opening is pathetic, and the fumes ARE dangerous

What kind of tape you use to sealed bottom of the frame??

where did you buy the caustic soda?

LOONY

I don't understand it. My caustic soda does not react that strongly at all. Just a bit of prickling and that's it. Had it for hours in the seat post .... no visible effect.

Having worked in the chemical industry with NAOH sodium hydroxide , you should not be showing people how to do this without a full face shield and Chemical suit and rubber boots this is how it should be done ruclips.net/video/GR9DKMuctTE/видео.html

Thanks for posting this. I'm currently soaking a front fork in casutic soda to dissolve the remainder of a very stuck handlebar stem. I started working with a much weaker solution and it was slow. I've bumped it up now that I see your frame didn't melt or the gas didn't cause an explosion! I will pass on the bare flame and bottle-shaking steps though!