I am using epoxy as my high build primer over poly primer. Before spraying epoxy over bare metal, the metal was sanded with 80 grit. Before spraying epoxy over other primer, it was sanded with 180 or coarser.
At this point, I think I have enough epoxy (older than the 7 day recoat window) on the car to perform final sanding, 320 grit dry, then 400 grit dry using a hard block, and finish with P600 grit wet using a soft block.
If I find out, I am wrong about having enough epoxy to finish sanding and need to spray a couple more coats of epoxy. Do I need to sand the epoxy back to 180 to have enough mechanical bond, or can I leave it at 320,400, or even P600 grit?
At this point, I think I have enough epoxy (older than the 7 day recoat window) on the car to perform final sanding, 320 grit dry, then 400 grit dry using a hard block, and finish with P600 grit wet using a soft block.
If I find out, I am wrong about having enough epoxy to finish sanding and need to spray a couple more coats of epoxy. Do I need to sand the epoxy back to 180 to have enough mechanical bond, or can I leave it at 320,400, or even P600 grit?