Best Non skid Deck Paint?

[rcnight]

I recently built a flats boat and spray painted it with Imron. I purchased a non-skid additive from the store, I believe there were micro-sheres. I added the appropriate dose per instructions but did not think it was enough, so I tripled the dose and sprayed it. The decks turned out great, probably the best thing on the boat. My decks were flat and void of any pre-existing surface, I'd think you might need to remove any existing non-skid before refinishing. With allitle taping, you can do get very professional looking results.