that's wierd, but i have to say you might want to wait a bit and let it dry really good, it does tend to "harden" over time, but i can say that i can't even scratch a small spec off my tire!!! perhaps you wetsanded too fine between coats? maybe when you prepped the pannel it was also too fine/smooth? how many layers are you scratching off? i find my paint on both cars very scratch resistant. there's no way i could scratch the paint with my finger nail no matter how hard i try (and i just did on the bottom of the trunk lid!!) but then again i can't comment on how it scratches off after reciently painting.