 Acrylic, not polycarbonate, but acrylic, which is a much better product. It's guaranteed not to fade more than 3% over the next 30 years. One of the things that concerns me at my house is the slab, the patio is cracked because it's a 60-year-old house. So I wonder if, A, would that have to be redone, or if not, how do you get around it?