so let me get this straight, i have a car that needs to be painted because of the addition of a body kit and other accessories. i have already gone over original gel coat with a touch up spray can just so i wouldnt have to drive around with a multi color car. the paint is somewhat gritty however due to the overspray from the spray can. can i still just prime the whole car with a few coats and not have to worry about the roughness as long as i apply the black layer aftery the primer to wet sand doesnt sound too complicated if this is the case. ne specific grit sandpaper u think i should use?