I think only direct UV exposure will effect. The undercarriage should be pretty safe. Under the hood would be border line if you open it up at shows all the time, I think.
I did my entire frame and topcoated half of it with their Chassis Coat. The Chassis Coat was such a PITA to work with, I didn't bother doing the whole frame. If you top coat, use something else. Unless you think you can handle the stuff better than I. I'm no painter. [img]smile.gif[/img]
It's been 2 years, I think, and nothing looks faded or discolored.
Proud Owner: '69 Chevelle
Malibu: 454, Richie 5, 3.42 posi