I guess not all naysayers took the suggestions to first read the moparts post. Your statement could be true for Rustoleum (I haven't researched). The Interlux Brightsides polyurethane paint I used is used to paint boats, usually fiberglass with a degraded gel coat. They claim it lasts ~5 years, but my car isn't sitting in the sun and salt spray so I am hoping for 20 years.
