I just got some tri-coat paint for a key mark I have in my 08 Tahoe with diamond white paint, 800J paint code, and I was curious as to how I would apply it to a key mark seeing as there is 3 layers, base, mid and clear coat. I was putting on the base coat today, and I was getting it all around the outside of the scratch and when I went to remove it with laquer thinner I'd end up taking off the fresh paint I just filled in the scratch with. How would I go about doing this? The mark isn't down to the primer but otherwise pretty deep. Should I just fill it in, wet sand it down with some 2000 and then add the midcoat? Or what?