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Zero I would beware when doing that... I agree with Don to a certain extent but you must remember when you scuff with scotch brite or 600 or 800 grit paper you are opening you self up to reaction between factory paint and your art work paint...IF you are using auto air or some other water based paint you might be ok.... But if you are using your regular auto paints you might want to lay down a good clear sealer...Like dupont velva seal if they still make that... its slightly milky but you can add a few drops of black into it and you are good to go or any other kolor you wish... Bull Dog is a very clear sealer and adhesion promoter.. I only say this because I have tried doing that in the past only to have factory clear bubble and react poorly to my methods...Just remember if you are clearing with a good catalyst based clear you do not want to jeperdize your work so sealing is always best... Hope this doesnt step on anyones toes...