I never tried it before but I don't see why not.
The trick to painting Epoxy is to get rid of the Amine Blush that occurs when it cures. It is basically a waxy substance that comes to the surface. Now if those two part epoxy stick produce that much blush I do not know, but with other epoxy say West for example, if you want the paint to stick you need to let it thoroughly cure for a few days then give it a good wet sand or scotch-brite scrub with plenty of water. I have spray painted West with Krylon paint on a few boat projects and it still looks great three years later.
Hope that helps.