You can apply it over paint or bondo but it is only effective on bare metal. Just make sure you shoot the first coat of epoxy with NO reducer, just 1:1 with activator. : 052517 1 .DESCRIPTION AND USES . This helps remove sanding scratches and small surface defects. Hope this helps, Mark Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Exercise care when using this product over enamel finishes as lifting may occur. Self-etching primers have to have another primer over the top of them or the paint won’t adhere. Putting more of the primer won’t make it work better. SELF ETCHING PRIMER Form: GDH-105 Rev. The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. Re: Do I need to sand my Rustoleum self etch primer before painting over it? I then use a primer sealer or epoxy primer to seal up the surface then apply the top coats. This Self-Etching primer uses an aggressive solvent system to assure excellent adhesion to clean, rust-free metal. Some are a few hours; others allow several days. Self Etching Primer is a first-step coating that provides excellent adhesion to bare substrates. 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. Epoxy works pretty good over Acid etch as the epoxy does not tend to melt the etch like, say a 2k primer would, only issue will be is the etch is the weakest link but normally OK, if done this way. Self Etching I bought the usual gaggle of stuff from a local paint supplier to paint my frame. Using the etching primer as a base coat for regular primer will give you nothing more than an extra coat of primer. In the meantime, it’s important to talk to your paint dealer about the time window allowed between the primer and paint topcoat. Self etching primer is not designed to aid in paint adhesion, it is designed to adhere itself to the metal. It can’t be an epoxy primer, but it can be a urethane primer. 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. A high-quality formulation allows for maximum adhesion under all types of automotive finishes on plastics, fiberglass, bare steel, aluminum and stainless steel surfaces. Eastwood's Self-Etching Primer is lacquer-based. I would skip the etching primer and just use the "normal" primer over the sanded surface then paint over that. The self-etching primer is usually gray or olive drab gray but the color is just there to show you where you’ve put it on and it is very thin and one thin coat is enough. 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