I primed my car with evercoat slicksand and didn't have enough primer to do the whole car. I started sanding and realized that i needed another coat on everything that had been done previously as well. My question is does it need to be sanded to reapply the primer? If it does, does it have to be completely smooth as there are lots of ripples and bumps on the surface which comes with using a polyester primer i guess. Thanks for the help!