It can’t be an epoxy primer, but it can be a urethane primer. That etches into the metal and then the primer chemically bonds to it. Self Etching Primer is a rust preventive coating that etches and primes in one coat. When using epoxy primer it doesn't matter which goes first. The tell-tale feature will be on the description of the paint container, specifically identifying the self-etching feature included in the paint. 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. Thanks for your reply. Hello, i was wondering which of these will be best for my floor pans and other chassis parts. Self etching only needs to be applied to Bare Aluminum. I want to fill in all the small grinding marks left from the manufacturing process. This helps remove sanding scratches and small surface defects. The most common paint type comes in a spray can version, which is the easiest to apply. Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Self-etching primers have to have another primer over the top of them or the paint won’t adhere. Self Etching Primer … The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. 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. Feb 14, 2020 at 7:57 AM #4 #4. It is also sold as an aerosol mixture, which can be used as simply as spray paint. Hope this helps, Mark Self-etching primer frequently comes in a gray color, similar to other primer paint. Rust-Oleum® Self Etching Primer prepares bare metal, aluminium and fibreglass surfaces to promote maximum adhesion and smoothness of the top coat. Rustoleum rattle can self-etch primer don't require filler primer, but the few Pro brands I looked up do (SEM, Eastwood). A note about self-etching primer and aluminum. Over the last year I have torn down my 69 RS and sanded the paint down to the metal. Yota_Ivan, Jan 31, 2020 #3. I plan on one of these primers, with rustoleum enamel gloss black top coat. Aluminum is especially difficult to paint. When using etch primer the filler should go on to the bare metal first and then all is covered with etch primer. This product is formulated to stop rust and is an essential step to achieve a professionally finished look. If you wait more than 12 hours you should, like he said scuff down with a Red scotch pad and reapply, then prime. Self-etching primer is a primer that can come in an array of mixtures including a compound mixture that you have to mix yourself. Apply self-etching primer as a base coat. This will give the paint a texture to grip on to. 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. You need to use self-etching primer to paint aluminum, but prep work is especially important. 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. Posted: Fri May 01, 2020 9:44 pm Post subject: Rustoleum farm implement vs self etching vs epoxy primer? 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 In the meantime, it’s important to talk to your paint dealer about the time window allowed between the primer and paint topcoat. Some are a few hours; others allow several days. 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