The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. Self-etching primers have to have another primer over the top of them or the paint won’t adhere. Yota_Ivan, Jan 31, 2020 #3. Rust-Oleum® Self Etching Primer is designed to prepare bare metal, aluminum and fiberglass surfaces to promote maximum adhesion and smoothness of the topcoat finish. I want to fill in all the small grinding marks left from the manufacturing process. I plan on one of these primers, with rustoleum enamel gloss black top coat. Once applied and dried (couple of hours) Use a 3m Scotch Brite pad to knock down any nibs and then shoot the Bare metal primer over the entire Prepped(Acetone wipe down) surface. Rust-Oleum 249322 Automotive Self Etching Primer, 12 oz, Dark Green Spray Paint Self etching primer is suitable for use on bare metal, aluminum and fiberglass surfaces Oil based paint with Stops Rust formula provides rust resistant base coat for cars, trucks and other vehicles Re: Do I need to sand my Rustoleum self etch primer before painting over it? Self-etching primer is a primer that can come in an array of mixtures including a compound mixture that you have to mix yourself. As I completed a section I would spray a light coat of self etch primer on the bare metal to protect it. The most common paint type comes in a spray can version, which is the easiest to apply. Rust-Oleum® Self Etching Primer prepares bare metal, aluminium and fibreglass surfaces to promote maximum adhesion and smoothness of the top coat. Aluminum is especially difficult to paint. Hope this helps, Mark Thanks for your reply. That etches into the metal and then the primer chemically bonds to it. If you wait more than 12 hours you should, like he said scuff down with a Red scotch pad and reapply, then prime. Your self etch primer should be just a really light piss coat, you don't want a thick coat, it could cause your top coats to crack over time. This helps remove sanding scratches and small surface defects. Posted: Fri May 01, 2020 9:44 pm Post subject: Rustoleum farm implement vs self etching vs epoxy primer? This will give the paint a texture to grip on to. Self Etching Primer … Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Some are a few hours; others allow several days. A note about self-etching primer and aluminum. I then use a primer sealer or epoxy primer to seal up the surface then apply the top coats. The tell-tale feature will be on the description of the paint container, specifically identifying the self-etching feature included in the paint. Self-etching primer frequently comes in a gray color, similar to other primer paint. Apply self-etching primer as a base coat. In the meantime, it’s important to talk to your paint dealer about the time window allowed between the primer and paint topcoat. Feb 14, 2020 at 7:57 AM #4 #4. Self-etching primer adheres to tin-plated steel really well and it dries to a somewhat rough finish that makes it easy for the top coat to grab onto. The reason being that the acid/chemicals in the etch primer "could" be trapped under the filler and cause it to break down if the filler is applied over the etch primer. When using epoxy primer it doesn't matter which goes first. Self Etching Primer is a rust preventive coating that etches and primes in one coat. Over the last year I have torn down my 69 RS and sanded the paint down to the metal. It can’t be an epoxy primer, but it can be a urethane primer. 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