Not sure what to do with old paint cans cluttering up your basement or garage? Follow this action plan to either condense or dispose of your surplus—and win back some valuable floor and shelf space in the bargain. 1. Determine if the paint is still good. Solvent-based paints have a 15-year shelf life. If you can stir it, it’s probably okay to use (even if you have to remove the “skin” on the surface first). [...]