no need for a thick layer, well, this was a final layer and each layer got sanded down to the tube metal and then water is put on it and that shows the tiny tiny pinholes so then we bake it dry again, cool it down, smear on another layer and sand it away again. I originally was going to use powder to fill the pits but they proved to aggresive in spots, so I had to strip the bad areas again and start the jb filling. The next thing is a wet black coat, then the flake, then the candy. DO WORK!