I am a real green thumb at body work so this will mostlikly be a dumb question. I am repainting my wifes 89 jaguar. It is red. Ok here is the question. I started sanding it down with an air longboard sander with 80 grit paper.(repairs have to be made).When first starting a area the dust from sanding is white, then after a few minutes it will burst red. I guess the red is the main color , but is the white dust the clear coat. If an area is not in need of body repair how far doI have to sand it down ...just ruff the clear coat or all the way into the color coat.