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