Acetone is a good solvent for many plastics and some synthetic fibers.
It is used for thinning polyester resin, cleaning tools used with it, and dissolving two-part epoxies and superglue before they harden.
It is used as one of the volatile components of some paints and varnishes.
As a heavy-duty degreaser, it is useful in the preparation of metal prior to painting.
Familiar household uses of acetone are as the active ingredient in nail polish remover, and as paint thinner.