hello, wyatt as i said before i would just paint it with west epoxy or any other epoxy just for the protection of the old gel coat. for what and where you are right now i dont think you need anti fowling paint. giving it a nice seal with epoxy will let you clean it easier with out harming the old gelcoat. the epoxy wont let critters grab the porous gelcoat
what have you done to the boat sense we looked at it?