UV-Cure Gelcoat (Clear, Fast Production)

This clear UV-cure gelcoat is a photoinitiator-containing unsaturated polyester or acrylate-modified formulation designed for high-speed in-line composite production using UV lamp systems. Unlike conventional MEKP/cobalt gelcoats that require 20–60 minutes for ambient temperature gelation, UV-cure gelcoat achieves full surface cure within 5–30 seconds under appropriate UV irradiance (typically 80–120 mW/cm² at 365 nm), enabling conveyor-line production of FRP panels, bath surrounds, and sanitary ware. The clear formulation allows decorative prints, stone effects, or colored backing layers to be visible through the cured gelcoat surface. Surface hardness after UV cure is excellent, with pencil hardness of 2H–4H and Vickers hardness of 30–45 HV. The formulation contains a UV absorber package to protect the cured surface from post-cure yellowing. It is applied by curtain coater, roller coater, or spray at 80–150 g/m² wet weight. The product is virtually styrene-free or contains reduced reactive diluents with low vapor pressure, supporting cleaner production environments. Compatible with continuous UV-cure line processing at speeds of 5–20 m/min.