Cabin top is glued by epoxy (Sicomin SR5550 with SD 5504 UV stable hardener) resin and sanded. Every hole of screws is also filled with epoxy resin, Silicell and Treecell mix gave me high density material. Edges are strenghtened with glass tape the same way as inside. The deck top is not glued yet, because I have run out of resin. I had to reorder from Bonn, Germany.