Two things to keep in mind: 1) if it's a solvent based paint such as dope, laxquer and etc, painting it over another paint is dicey at best. Always test it first. 2) If the paint is catalyzed it will go over practically anything with no problem. Being catalyzed, it will also be heavier than a solvent based paint. What ever you spray on weight wise stays on as it "cures" as opposed to evaporating.