On the whole most Paint & Antifoul
are compatible and can easily be over coated, however, some basic rules should be applied:
As with any painting project the condition of the surface to be painted must be good - i.e. free from contaminates and in a sound condition.
A hard/non-polishing antifouling will leave an exhausted layer of resin at the end of the season. This should be wet abraded before applying a new coat onto it, to maximise the performance of the new antifouling.
A 'Teflon' antifouling can be over coated assuming it is in good condition and has been washed - DO NOT
abrade before applying new antifouling.
A traditional/soft antifouling should be sealed with Underwater Primer before applying an erodible or hard antifouling on top of it.