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Jeff, I wasn't aware of that as a possibility. If that's so, would you recommend sanding the hard epoxy bottom paint off, down to the gelcoat, before applying a few coats of an ablative antifouling paint? My guess is that the ablative paint will also be porous so that water will still be right up against the gelcoat--so would it make any difference?
My guess is that the only way to really protect the hull would be to sand it off, add a real barrier coat like Interprotect, and then bottom paint. However, in my situation where I leave the boat in the water year round (BC, Canada), I'm thinking I wouldn't get the hull dry enough in a reasonable time to avoid trapping moisture in there with the barrier coat, so I'm probably best off just applying bottom paint, watching for and fixing any blisters (so far none on the 1984 boat), and going sailing.
Last edited by FrankLanger; 08-25-2007 at 10:49 AM.