(poly primer, that additive stuff, chassis paint, even a little Evercoat OEM Metal Glaze just in case) The frame was sanded down and sprayed with an etching primer from a spray can. I had no need for a gallon of DP90 + gallon of Catalyst. Putting more of the primer won’t make it work better. I then use a primer sealer or epoxy primer to seal up the surface then apply the top coats. Self Etching Primer is a first-step coating that provides excellent adhesion to bare substrates. Hope this helps, Mark In the meantime, it’s important to talk to your paint dealer about the time window allowed between the primer and paint topcoat. Exercise care when using this product over enamel finishes as lifting may occur. It can’t be an epoxy primer, but it can be a urethane primer. To get the primer to stick over paint could take up to four or five layers before being able to fully stick and cover up the under paint. 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. This Self-Etching primer uses an aggressive solvent system to assure excellent adhesion to clean, rust-free metal. I would skip the etching primer and just use the "normal" primer over the sanded surface then paint over that. : 052517 1 .DESCRIPTION AND USES . Some are a few hours; others allow several days. Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Eastwood's Self-Etching Primer is lacquer-based. Dupli-Color® Self-Etching Primer etches and primes bare metal in one step, making it ideal to use as the first step in all automotive priming projects and for use on spot repairs. Just make sure you shoot the first coat of epoxy with NO reducer, just 1:1 with activator. Self-etching primers have to have another primer over the top of them or the paint won’t adhere. 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 not designed to aid in paint adhesion, it is designed to adhere itself to the metal. SELF ETCHING PRIMER Form: GDH-105 Rev. The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. You can apply it over paint or bondo but it is only effective on bare metal. Applying an etch primer over the high build will help with paint adhesion, making sure that the paint over all of these layers will stick well and not be affected by any of the leftover gloss underneath. Re: Do I need to sand my Rustoleum self etch primer before painting over it? This helps remove sanding scratches and small surface defects. Self Etching I bought the usual gaggle of stuff from a local paint supplier to paint my frame. 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