Look at other discussions on acetone. I cannot get the search option to work or I would post links.

You do not have to go to a paint department.
Wal-mart or the dollar store sell it. It is labeled as pure acetone.
Do not get fingernail polish remover if it has added dyes or perfumes - if the bottle says pure acetone - it is fine. I have used it on hundreds of coins, and conducted an evaporation test on glass before first using it (to see if here was residue left behind when the acetone evaporated).
Don't be alarmed when you read the ingredients label on a bottle of "pure" acetone and you see a very minute additive. The additive (Denatonium I think) is the most bitter tasting chemical known, and it is potent enough that extremely small amounts make it so people won't drink the acetone.
The chemical is added in such small quantities that the acetone is legitimately considered pure (again there was a discussion on CCF about this, but the search just freezes on me or the link would be included in this post.)
Here are examples of two I have bought before. The typical nail polish remover-shaped bottle was from the Dollar Store, and the other one is from
Wal-mart.

