Our specialty arch-windows are made from 5mm pine core wood laminate, dried to 12-14% humidity. When assembled, the products are jet-flow impregnated with "Gori 356" wood protective coating. All connections are applied "Gori 647 sealer" that caps the end-wood, primed with one stroak "Akzo Nobel US primer" and painted with one coating of "Akzo Nobel US A" paint.