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