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