I don't think I've bought any for a while. However, I think it is sold in the building supply megastores.
Look in the solvent section near the paint supplies.

We also used it as a PVC Pipe cleaner/solvent when we had a lot of pipe to lay at my parent's house (before the purple stuff).

See attached pictures. Pure acetone is available in any good industrial supply. Automotive supply, paint shop supply should have it. A quart will likely set you back 5 or 6 bucks.
Get the MSDS and a few labels. If you mix up a batch of Acetone & ATF you may want to put a label on it.

I've had this gallon in the workshop for over a decade and its still about 90% full. I'd gladly trade a quart of acetone for a pint of Kroil !!!

Acetone is as close to a universal solvent as you can get and it evaporates very fast, leaving no residue.
Its like "perc" ( perchloroethylene) but cheaper and easier to find.
I used it or tried it with everything except iso-cyanurates.

Bink




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Aceteone and atf doesn't work very well. Acetone is an okay solvent, and will remove some stuff, and ATF can be an okay lubricant, and has some penetrating properties, so it's not surprising it does okay, and I'm sure it's better than wd40, which isn't a penetrating oil at all. The "test" linked to above is not well controlled, and not representative of how penetrating oils need to work. Big clue: were it really twice as good a kroil, someone would bottle it up and sell it.

FWIW the 'rapid evaporation' of acetone means the vapor is all around you, kind of like natural gas if you open the gas tap, though natural gas is lighter than
air and will rise, where acetone is heavier and sink. Vapor is quite explosive, so outdoor work is advisable. For same reason mix of atf and acetone will have
a relatively short storage life as the acetone vaporizes. Storing acetone is chancy as getting a really good seal on the container is hard so you put it up and
several months later the acetone is gone. Binky's results are not common. As to leaving "no residue" as a solvent, certainly pure acetone doesn't but if you
use it to dissolve something, whatever you dissolved will be left as residue. Since it evaporates so fast using it as a cleaner is chancy.

I'll also add that if one welds or brazes after doing some chemical clean up be real careful. I don't remember the actual chemical involved but Steve Garn from BREW almost died from the fumes created when he was doing a weld repair on some equipment that had been cleaned with something nasty. Andy.

Your body actually makes and metabolizes acetone and small ketones at times. It is essentially non-toxic in low doses, although perhaps some localized burning. I don't think I'd want it in my eyes. ATF has lower volatility. Burning substances, of course, can change them.

Hopefully the welding/brazing will be completed before the seat post is worked on, but I think there were in different parts of the bike.

I have seen many seat tubes buckled just above the bottom bracket, right in the neighborhood of where the op has his crack problem. I don't understand how the loading or force distribution works, but it is most definitely a high stress area.

You are thinking of PERC .....

In a posting just above I mentioned "perc". Same stuff. MSDS regulated.

Tetrachloroethylene, also known under the systematic name tetrachloroethene, or perchloroethylene ("perc" or "PERC"), is used in the dry-cleaning industry or (possibly) to remove oils and caffeine from decaffeinated coffee, but can, in the presence of the temperatures over 600˚ Fahrenheit, become phosgene gas, which is VERY nasty. Using it to clean up metals to be welded is not a good idea.

Binky

Brake cleaner: Safety Alert! Brake Cleaner = Phosgene Gas - BREW Bikes LLC

I was pretty sure that was the case. If I remember right, all an acetylene tank is, is a sponge and acetone...

I see acetone for sale at our local Ace hardware's paint department, right next to the other solvents like lacquer thinner, denatured alcohol, etc.

still off topic, but for stuck things I like Freeze-off