With California (and other states such as New York) having strict Volatile Organic Compound laws, painters are somewhat limited when it comes to primer. Solvent-based primers, although preferred by most painters, can harm the environment, so a water-based primer must be used in a select few states . Our friends at STREET RODDER recommended a water-based epoxy primer, like what’s pictured from Squeeg’s Kustom’s in Chandler, Arizona. This primer can actually be sprayed straight to metal or even over old paint, as long as it is sanded. The green color is actually a zinc phosphate, which is an inorganic compound that resists corrosion and also helps it adhere to metal. Solvent-based primers can sometimes lift old paint, but with water-based, you can spray over old paint and it won’t lift. However, it won’t stop an old paintjob from coming apart if it was going to anyway, but if you have a decent paintjob that’s nice and settled you don’t have to strip the car to bare metal before laying down the primer.