This stuff is the best adhesive we have ever used. Excellent adhesion to Acrylic, Polycarbonate, Fiberglass and metal. UV resistant, easy to apply, requires no primer. Just schmear it and forget it…Cleans up with paint thinner or diesel fuel. Tack in a few hours, full cure in a week or two. Use above water line We have been selling and using this product for 15 years. We use it on our own boats. Available in any color you like so long as its black or white! You can buy more complicated or more expensive sealants but you will not find one better.