UV Resistant Epoxy Curing Agent DH-3239 Hardener DH-3239 helps outdoor epoxy coatings hold their color and gloss under prolonged sunlight. The cycloaliphatic structure limits photo-degradation, delaying chalking and yellowing on exterior floors, terraces and architectural surfaces. Combined with water spot resistance, it suits open-air installations in sunny climates. Product Specifications Property Unit Value Model - DH-3239 Color - Gardner color; ≤2 Appearance - Colorless