Because its opaque pigments block the sun’s UV rays, an exterior-grade oil- or water-based paint is the longest-lasting and most-protective finish you can apply.Your best bet is to sand the door down, and finish it with multiple coats of an exterior spar varnish that’s made for boats. Spar varnish contains ingredients that block UV rays and is more flexible than standard polyurethane, so it adheres better without cracking or peeling.First, lightly sand the entire surface and wipe it down with a rag dampened with mineral spirits. Then, simply apply two or more coats of a fade-resistant finish or exterior paint with ultraviolet protection.
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