UV-Resistant Outdoor Gelcoat

This UV-resistant outdoor gelcoat is based on an isophthalic resin system with an advanced UV stabilizer package comprising HALS (hindered amine light stabilizers) and benzotriazole UV absorbers, formulated to maximize long-term gloss retention, color stability, and chalking resistance for exterior composite applications. Suitable for roofing panels, outdoor signage, leisure structures, and architectural cladding where premium outdoor durability is required. The UV stabilizer package significantly extends the useful cosmetic life of the gelcoat surface by absorbing UV radiation before it can cause polymer chain scission and chromophore formation (yellowing). Available in white and standard colors. Pre-accelerated with cobalt, catalyze with MEKP at 1–2%. Gel time 25–45 min at 20°C with 1.5% MEKP. Barcol hardness 42–50 post-cure. Gloss retention after 24 months Florida exposure typically exceeds 65%, compared to 40–50% for standard iso gelcoat.