best thing i've found for paint chips is doctor color chips, but it's not perfect, just better and tedious. there's also the duplicolor and blob remover approach which i tried and may have actually had better results with, but a coating doesn't do anything for chips. If the paints gone, you need to fill in the paint. If there's a scratch in the clear, a polish will eliminate it. A coating just protects what's already there, which is why correction is key.