The bilge under the engine I would paint using a barrier coat paint, like Interprotect 2000E.. It will help protect the fiberglass from osmosis from the bilge to the exterior. It should be just fine on the fiberglass, given that the fiberglass isn't bothered by the temperature, it shouldn't be either. You could probably use it on the plywood, MDF and underside of the cockpit footwell too, but if you do that, I'd go with the white, rather than the gray.
IMHO, it shouldn't get hot enough to damage the paint, given that it isn't damaging the fiberglass, wood or MDF. You might want to call Interlux and see what they say about using it for this particular project.
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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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