Use high-gloss clear acrylic varnish
Apply multiple thin coats of polyurethane
Use epoxy-style gloss spray finish
Brush on clear gloss medium for crafts
Seal with UV-resistant clear topcoat
Use self-leveling clear gel medium
Apply clear nail gel and cure with UV lamp
Use clear casting resin alternatives like Jesmonite sealer
Polish the surface with fine-grit sandpaper before sealing
Buff between coats for extra shine
Use a glass-like acrylic pour medium
Finish with a high-gloss automotive clear coat
Add depth with layered transparent paint or ink
Use clear glaze over metallic or pearlescent layers
Choose smooth, non-porous surfaces for better shine
Avoid matte sealers and textured finishes