Unless the manufacturer recommends it, you should avoid using an epoxy primer over a self-etching primer. It creates an excellent adhesive surface for subsequent paint layers and acts as an effective shield against the acids in the self-etching primer. Urethane primer works well over self-etching primer. However, with most self-etching primers, you need to apply a layer of primer first. You can apply enamel paint over self-etching primer if the manufacturer’s instructions say you can. (sources: ScienceDirect and Mindat)īelow is some more information on what (and what not) to use over a self-etching primer layer: Primers typically contain titanium, nickel, tantalum, or aluminum, which are excellent insulators. Regular primer increases the metal’s passivity by forming an oxidized layer to seal it and provide additional rust protection. If you don’t apply a regular primer on top of the self-etching primer layer to seal it, the acids will eat away at the paint, causing it to splinter and flake. (source: SpringerLink and National Library of Medicine) It seeps into it, allowing the zinc particles to release and form a corrosion-resistant barrier. After applying a coat of self-etching primer to bare metal or fiberglass, the phosphoric acid corrodes the metal. Self-etching primer contains phosphoric acid and zinc. However, applying a regular primer layer on top prevents the acids from interfering with subsequent layers and helps the paint adhere correctly. You can paint directly over self-etching primer only if the manufacturer advises that you can do it. You’ve also probably heard that self-etching primers will protect the metal, but can you paint the metal directly over the self-etching primer? If you’re restoring an old metal or fiberglass object, you’ve probably removed the old paint to uncover the raw material. Can You Paint Directly Over Self-Etching Primer? Read further to discover everything you need to know about self-etching primer. Sanding the self-etching primer layer can also improve paint adhesion. However, most self-etching primer manufacturers recommend applying a layer of regular primer on top to provide a better painting surface. You can paint over self-etching primer once it has dried and cured. But can you paint over self-etching primer? GLISS may flash slightly faster when applied over CQuartz.When working with untreated metal, it’s best to apply a coat of self-etching primer to prevent corrosion. If CQuartz was IR cured then only 1 hour is needed. May be applied 4 hours or longer after CQuartz. If layering on top of itself, wait 1 hour between coats. If haze is left on too long then reapply and immediately wipe off. Wait until white haze forms and immediately wipe all residues off using a microfiber. Wipe down with CarPro Eraserĭrag one line of product across length of suede wrapped applicator.Īdd more product to applicator as needed to keep a wet, even application. Choose decon tools based on type of contaminant and if coated or uncoated.
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