6 Vic mixed up our primer per the instructions (25 oz. primer, 5 oz. hardener and 1.5 oz. accelerator) and poured it into the gun. For this job we used Commercial Performance Coating’s HSP-2128 Tintable Polyurethane Primer, which happens to be white. This primer has a 2.1 VOC rating so it’s legal for us to use in California. We had our paint supply guy, Dave Finley, add a bunch of toners to get us the Red Oxide hue, but this created another issue (more on that later).