I pulled out a rear quarter window to address very slight rust before it got too far gone; after reading about Ospho I figured I'd try it. I am in the process of doing my gutters with self leveling seam sealer and my touch up paint work has been with 2K Epoxy Primer and Freeborn Red rattlecan from Automotive Touchup. I am readying that epoxy primer isn't best to put on Ospho; if this is the case what is recommended that I might be able to readily source?