Epoxy primer actually seals out the oxygen from the metal, leaving no chance of rust or corrosion forming on the surface like some cheap spray bomb type primers. Two-part epoxy primers go one step further by including zinc phosphate, which increases its corrosion-inhibiting properties.Click to see full answer. In this regard, does epoxy stop rust?Less time sensitive but more expensive. So even with very light surface rust, the epoxy wont prevent further corrosion? Rust needs water and oxygen. The epoxy will seal these things out, but rust in pits is porous and will contain some water and some oxygen.Similarly, is epoxy primer necessary? Epoxy primer is considered a good standard base when it comes to ensuring the auto paint bonds to the metal and promotes a quality paint finish. It’s formulated specifically to prevent corrosion, so epoxy primer won’t sand as well as other types, like urethane primer. Keeping this in view, does primer prevent rust? “You need a primer that will match the surface. “A lot of our primers have rust preventive properties. They will stop any rust from adhering to the surface or will kill the rust. If you have a really rusty surface that you want to paint, even flash rust, we have a product that will remove the rust,” said Williams.What is epoxy primer used for?Epoxy primer is a sealer that produces a good surface finish on applied top coats. A two-part epoxy primer contains zinc phosphate, which acts as corrosion-inhibiting pigment. Epoxy primers can be used to waterproof materials that consequently protect the bare metal from oxidation.

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