i have a bit of experience doing body work and painting Saleen parts and let me tell you... they all suck. the key is using lots of flex primer. i have the heat extractor hood on my gt and that thing was a nightmare to get right because it flexes so much over 80 mph that it was gettin stress cracks and crows feet.
but ive also seen professional shops paint side skirts, bumper and wings from saleen and months later theyre all cracked and peeling.
just try to get the prep work PERFECT and u may be ok