I'm far enough along on my s & g kayak to start thinking about paint. I've read some good things about two-part polyurethane, but I don't have a source of supply and I don't know if it will be available in the color I want. (I have my heart set on Tweety Yellow). So my question is,would pigmented epoxy used as a final coat degrade from UV? Would the pigment, used in sufficient quantity to produce an opaque coat, compromise the properties of the epoxy? What say you all?