P.S. 1000 grit is very fine, you can actually polish 1000 grit scratches out with compound. If you are using a epoxy sealer and then your paint 320-400 grit would be a better option. A car doesn't have to be "smooth" it has to be straight.... and you need mechanical adhesion in the form of a good sand scratch. I would find it hard to trust 1000 grit to hold paint on a vehicle. You can clear coat over 600 grit without seeing the sand scratches.