I tried the Dolhpinite version of speed wax/antifouling, even talked with velocity about it they said its greaT. when I pulled the boat out in the fall the stuff actually turned yellow and absorbed the soot on the back transom. When dry its a hard rough surface.

velocity : smthg very funny and i dont have any chemical knowledge to explain this but: boat gets moss very quick in my cyrrent location ; it takes twice long in medditerian sea (south side of my country).water is more salty there may be this is the reason..