Join Date: Mar 2006
Location: New England
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Barrier coats are usually layers of epoxy, that are designed to provide a osmosis proof "barrier" so that you do not get osmotic blistering on the hull of your fiberglass boat. Vinylester resins are less prone to blistering than the polyester resins, and epoxy resins are even more resistant to moisture pentration. Usually, a boat is blasted, with soda-blasting being the newest way to do it, and then faired and coated with the barrirer layer. This is done by adding actual layers of epoxy, not just an epoxy-based paint. Then the surface is primed, often with an epoxy-based primer paint, and then the antifouling is painted on.
If your boat is stored in the water, but hauled for the winter, then I would recommend an ablative anti-fouling paint. Fresh water tends to have less growth than salt water. The reason I recommend an ablative paint, is that most ablatives can be hauled and stored ashore without having to re-paint them. Most hardcoat anti-fouling paints become inactivated when exposed to air for long periods of time.
What you have to do to repaint your boat really depends on what kind of paint is on it, and what kind of paint your putting on it. If you've got an ablative, and want to use the same stuff...just sand lightly and paint away. If you've got an ablative, but want a hard coat, you'll need to soda blast the bottom to get rid of the paint, and then prime and paint. If you've got a hard paint and want to switch to an ablative, you might need to soda blast, you might not... it depends on the two paints.
Not all paints are compatible with each other, so you really should contact the paint manufacturer to get their recommendation for bottom preparation.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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