Deadbeard:
If you''re doing the bottom for the very first time, you have some work to do before you should even start to think about antifouling
paint. You must first remove the wax that was used as a releasing agent when your boat popped out of the mold. There are commercially available products for this step. Next, a minimum of three coats of barrier, VC Tar is good for this although other companies make barrier finishes. As you probably already know, fiberglass is porous so you MUST seal the surface to prevent water infiltration, which can later manifest itself as blisters. Burnish the surface and apply two coats of antifouling
paint and you''re ready to go.