as someone else said just sand it down with 600 an spray it again...if you really want to ensure it sticks, sand it with 150-220 until there's no paint left on there, primer it, sand the prime with 600 grit then paint over it, then clear coat that. what's really going to protect the paint is the clear, the more coats the tougher it will be. just make sure the paint flashes (10-15 minutes between coats should cause the paint to flash, it will dry to a point where there is a different shade than the wet paint)
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