I have used testors, varied air brush paints, Krylon, Rustoleum, my wife's water based tole paint, fingernail polish and some stuff I can not remember. I found no difference in fish response. I think, but can not confirm that the clear topcoat seals everything anyway. I now use UV activated topcoat on special time consuming paintings. On simple single or dual color solid paint I still use spray clear Rustoleum or Krylon from a rattle can. On fingernail polish, I don't worry about a topcoat.
My problem is finding a good paint or dye that I can put on soft plastics that will last. I like to modify swim baits for salmon and ling cod trolling. I do believe color does make a major difference even though the fish may be seeing shades rather than color much like a black and white photo. That being said, I don't know if fish see color different than us at depths given their different cones and rods. Good question Commander. Thanks for bringing the subject up.

Headed down with the boys(Gregg and Ben) to the Raritan River) to chase the stripers. Launched out out Sayersville with intentions of hitting the bay if we didn’t mark any fish. Fish were abundant in the river so no reason to head out to sea. Water temp was 50* and most of the fish were hanging near the bottom. Threw 6” paddle tail Shad’s in bunker pattern and landed 5. Many bass were simply pecking the tails and wouldn’t commit, same comments from a bunch of others we spoke to. A few more degrees and it should heat up. Felt bad for captain Ben, he hooked up with a couple but lost them.