I can't tell you the chemical difference, but acetone is very hot with a fast evaporation rate. Acetone will soften or lift many types of paint. Mineral spirits and paint thinner are pretty much the same thing. Both are slower dying, mild solvents for reducing enamels and varnish. When it comes to cost, paint thinner is usually cheaper.
I always have a gallon of both in the shop and at home.
ACETONE is a VERY VERY VERY VERY FAST thinning agent but it is NOT paint thinner. DO NOT confuse acetone with paint thinner.
It's absolutely schitt when used for large panel repair. But GREAT for poly double coats or where it's compatible with0 the local surfactant.
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