epoxy resin coat over sanded/feathered antifoulant?

[phishown]

The bottom has about 30% antifoulant left after I sanded it The old epoxy resin coat and bare would make up the other 70% showing after I sanded. How would another coat of epoxy resin stand up with the antifoulant under it? Very thin layer of antifoulant left in spots! Thank You for your opinions!
Mark

[paul oman]

It is OK - we regularly have folks put epoxy barrier coats over well adhered bottom paint. I generally tell folks to just prep like you would for a new coat of bottom paint (or maybe just a little bit better).

paul oman
progressive epoxy polymers

[R.Floyd]

epoxy barrier coats over bottom paint?

This is what they mean by bad advice on the WBF.

Bottom paint is not meant to be sanded and "faired". It is a paint bourne PESTICIDE. It is chemically designed to hold moisture and its effectiveness lessens when it is dried. Regardless if its a modified epoxy or an ablative.

Barrier coating over bottom paint? WHY? Barrier coating is designed to stop water molecule penetration to pretect a hull from osmatic action.

Barrier coating over bottom paint is a waste of product. REMOVE all bottom paint before recoating. What epoxy resin are you using?

[ 03-09-2005, 01:18 PM: Message edited by: R.Floyd ]

[Todd Bradshaw]

Agreed. Your new coating is only as well bonded as the weakest link underneath it. Epoxy over paint is nothing more than a waste of resin and money. If the bottom was sound enough for it this kind of approach there wouldn't be any need for the epoxy in the first place.