no more than that... wet sand it with 1000...... then buff it with something from 3M.....a compound used for brigtning......my dad has his own custom body shop...... so yea i know.......maybe u shoulda had them prepped with real automotive paitns and products......i dont think u would hyave run into this but if the spray paint works then fine.... make sure u sand all over....dont stay in the same spot for long or ull go thru the material....same with the buffing.....both will bring out brightness,.. good luck