Select Appropriate Paint: Use acrylic latex, polyurethane, or epoxy paint specifically designed for fiberglass to ensure durability and long-lasting results. Understand Fiberglass Surfaces: Fiberglass is smooth and non-porous, requiring specific preparation and paint to ensure good adhesion and durability. Preparation is Key: Clean, sand, and apply a fiberglass-specific primer to enhance paint adherence for optimal results. High-gloss and flat finishes in quarts and gallons. Apply by. As an Amazon Associate, I earn from qualifying purchases. Proper Surface Preparation: Thoroughly. SENVEN Gloss Marine Grade Paint: Boat Marine Paint Touch Up Pen repairs chips, cracks, pits, gouges, scratches, and holes on watercraft like jet skis, kayaks, sailboats, yachts, dinghies, surfboards, and decks.