How can you remove primer from a painted surface like on a toolbox that has been sprayed with primer over existing paint?

Answer 1

Unfortunately primer is designed to prevent this, but if you know what kind of base the primer is (alcohol, acetone, water, etc., look at the primer's directions for its recommended solvents to be used for thinning or cleanup), you can try using a rag with that thinner to try to scrub away the primer. However, try this on the original paint first in an inconspicuous spot (the bottom, perhaps). If you're unlucky, the original paint may be damaged because it uses the same base as the primer, in which case, DON'T use this method.