Two paths:
**Quick**: light sand with 220-grit paper to even out the melt surface, then prime with FOAM-SAFE primer (water-based latex, or Plasti-Dip, or Plastikote Foam Coat). Then any acrylic/spray paint on top.
**Production**: laminate the cut foam with fibreglass + epoxy for a hard durable shell, fill imperfections with auto body filler, sand, prime, paint. This is how RC wings and surfboards get their durable surface.
DO NOT use solvent-based primers/paints directly on EPS — they'll eat the foam. Always test on a scrap piece first.
**Quick**: light sand with 220-grit paper to even out the melt surface, then prime with FOAM-SAFE primer (water-based latex, or Plasti-Dip, or Plastikote Foam Coat). Then any acrylic/spray paint on top.
**Production**: laminate the cut foam with fibreglass + epoxy for a hard durable shell, fill imperfections with auto body filler, sand, prime, paint. This is how RC wings and surfboards get their durable surface.
DO NOT use solvent-based primers/paints directly on EPS — they'll eat the foam. Always test on a scrap piece first.