- Apply Guide Coat To Primer
- Using a block, cross sand the primer using 220 grit sandpaper. (if you know for sure that it will notneed to be blocked a second time you can start out using 320 grit sandpaper.)
- Sand until all guide coat is sanded off, but stop sanding when you sand through to the metal or body filler. Try to keep these break through areas to a minimum.
- If the primer blocks out good, final sand the primer with 400 to 600 grit sandpaper. If not, repeat this process.
Now you’re ready to clean, mask and prepare for paint.