Depending on the matyerial (wood?) I'd sand it with 1400 grit paper, iuse an alcohol based primer ("KILZ"), then finish, perhaps with an epoxy paint.
~60 years ago I was painting inside the forward cabin of our boat. Not well ventilated and obviously often damp. Rolf, a painter at Goodhue Boat Yard taught me this: In a quart of oil based paint, pour off 1/4 inch, add 2 tablespoons of household ammonia and stir. This will thicken the paint, so add turpentine to get it back to proper viscosity (that's why drain some off). Worked well, no future mold, at least while we owned the boat. Covered in one coat.
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