Can you paint directly over self etching primer?

Asked By: Cellou Valdemoros | Last Updated: 26th March, 2021
Category: home and garden home improvement
3.9/5 (13,283 Views . 43 Votes)
You can't paint directly over etch primer. You need a surfacer or other primer/sealer over it. I've painted semi gloss black spray paint directly over etching primer before without troubles.

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Herein, should I sand self etching primer before painting?

You need to use self-etching primer to paint aluminum, but prep work is especially important. You have to sand the aluminum first, with 120-grit sandpaper. Follow up by wiping it down with mineral spirits. If you don't prep the aluminum well, the primer scratches off rather easily.

Similarly, what is the difference between primer and self etching primer? Epoxy primer is catalyzed and self etching is solvent based. Self etching primer bonds well to bare metal surfaces and can be top coated in a short period of time. Epoxy primer can be applied in heavy coats which can be guide coated and block sanded to remove small imperfections in the body.

Considering this, how long should self etching primer dry before painting?

For best adhesion, apply 2 or 3 thin coats and allow each coat to dry for 2 minutes before applying the next coat. Allow the final coat of Self Etching Primer to dry for a minimum of 3-4 hours before dry sanding, or 15 minutes before wet sanding with #400 grit sandpaper. Do not use near open flame.

Can you put body filler over self etching primer?

As a matter of FACT body filler works better when applied over a protective primer (epoxy or self etching) simply because the primer helps protect the bare steel from moisture. Body filler is extremely porous and will absorb moisture just from the air.

32 Related Question Answers Found

What is the purpose of self etching primer?

About Self-Etching Primer
Rust-Oleum® Self Etching Primer prepares bare metal, aluminum and fiberglass surfaces to promote maximum adhesion and smoothness of the top coat. This product is formulated to stop rust and is an essential step to achieve a professionally finished look.

Is etching primer necessary?

Etch primer is good but not necessary as long as you get rid of the light rust first.

What is the best self etching primer for bare metal?

Simply put, epoxy is the best primer for bare metal, making it excellent for newly fabricated metal parts or ones that have been fully stripped.

What is the best self etching primer for aluminum?

Rust-Oleum Automotive Self Etching Primer promotes maximum adhesion and smoothness of the top coat on bare metal, aluminum and fiberglass surfaces. Etches and primes in 1 easy step. Rust preventive for a long-lasting finish.

Do you have to prime over self etching primer?


You can't paint directly over etch primer. You need a surfacer or other primer/sealer over it.

Does vinegar etch aluminum?

Vinegar, a weak acid, can be used to etch aluminum in preparation for painting.

What kind of paint will stick to aluminum?

Rust-Oleum Professional Aluminum Primer is specially formulated base coat for aluminum surfaces. It provides a tight bond for the top coat, thus resisting the usual problems of blistering, flaking, or peeling paint.

Can you spray epoxy primer over self etching primer?

Re: Can epoxy primer be sprayed over self-etching primer (without ill effects)? It's fine to spray epoxy over self etching. But self etching is mainly to slow down rust before you lay down your filler or other high build primers.

Is etch primer waterproof?

Note self etch primer is out of fashion. Most people these days will use an epoxy primer instead which sticks well and is waterproof so you don't need to apply top coat quite so quickly. Self etch primer (was) recommended for bare steel, aluminium or GRP, and it won't flake off like a filler primer can.

Will Self etching primer stop rust?


After you remove the rust scales from the metal on your car, you need to apply self etching primer. It's a mix of phosphoric acid and zinc. It's purely a surface coating, and it doesn't stop the rust. It does, however, prevent the rust problem from worsening.

Does primer prevent rust?

“You need a primer that will match the surface. “A lot of our primers have rust preventive properties. They will stop any rust from adhering to the surface or will kill the rust. If you have a really rusty surface that you want to paint, even flash rust, we have a product that will remove the rust,” said Williams.

Can I paint over filler primer?

Filler primers
In most cases, the filler primer or high-build primer is also a urethane product. Because it has the texture to fill pits and imperfections in the sheet metal, an unsanded primer coat would be too rough to paint over without further preparation, which includes a sealing primer.

Can you apply body filler over sanded paint?

Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. However, with so many different types of aftermarket paint available (lacquer, enamel, urethane, water-based). We recommend that all paint be removed where filler is to be applied.”

Can you spray epoxy primer over old paint?

You can coat epoxy or urethane primers over old paint. I personally would not, but you can. It won't craze the paint like spraying laquer on old enamel. But you would really be better off just sanding it down to the factory primer, at least.

Should you prime before body filler?


We use 36 grit grinding disks to clean and texture the metal before applying filler. You can even use something as fine as 80 grit, just be sure to push the filler into the scratches so that it bonds well. No priming or etching is needed as long as the metal is textured and not rusted.

Do you primer before Bondo?

Bondo should NEVER be on top of anything but 32-grit prepped bare metal, if you want it to stick and last. You can, however, use glazing putty on top of primer sanded with 80-grit. Hope this helps!

Can you put spot putty over primer?

You can use glaze putty over primer. Either pin holes or lows or something that pops up after it's been primed on occasion. Let me give you one hint to help you, and you may be doing this, but use a Guide Coat in your body filler stages.