A coat of resin applied during the laminating process, just after the initial coat of resin and glass. So named because the resin and catalyst are mixed to force a fast gelling. The resin, also known as sanding resin, is also blended with wax substances to complete the hardening on the hotcoat's surface, thus permitting sandpaper work. The hotcoat seals the glass-resin layer, fills any bumps or holes, and is later sanded back to the original surfboard shape.