also EXIT1965- i discussed your scratch results with the tremclad tech dude, and he thinks it is soley a function of surface prep/contamination. if the paint came off in layers then that's a different story. but it goes right down to the surface. also he said it takes 14 days to dry fully, and 2-3 months to fully cure in hardness. that is typical with any auto paint.
i think if the paint is good enough for a rusty mail box which sits in the elements 24/7/365 without washing and waxing, it's good enough for my car!!!