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Self- Etching Primer for Painting Bare Metal. Visit any automotive forum and you can’t help but stumble upon a long running debate on which direct to metal product is better, etch primer or epoxy primer. You will hear all kinds of technical facts, personal experiences as well as flat out unsubstantiated opinion. Then throw in the thousands of products available for the job, each with their own recommendations, and you’ll find yourself overwhelmed. But after the smoke finally clears the fact remains that both types of primers will give you successful results – if used correctly.

The route you choose depends on the condition of the metal you’re starting with, the time you have to devote to the bodywork and paint process, your budget and a bit of personal preference. Download Whole War Machine (2017) Movie. Above all else, once you decide on your color, use that company’s paint products from the bare metal stage to the final topcoat.

Mixing products to save a few bucks will most likely cause adhesion problems – no matter which bare metal primer you choose. Self- Etching Primer. An etching primer uses an acid to chemically clean and micro- etch the metal surface for a better mechanical bite to promote adhesion with the layer of high- build primer to follow while also providing a layer of corrosion resistance on the metal.

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Because it cures quickly, it’s the method of choice for collision shops. But a key difference with etch primer is that you need to apply your filler or bondo first directly to the metal before spraying it. An example of the application order on bare metal is: 1) bodywork including filler/bondo 2) paint prep solvent 3) self- etch primer 4) high- build primer 5) basecoat 6) clearcoat.

Recommendations. If your metal surface is mostly smooth, you don’t have areas with rust problems and you don’t plan on having to use additional filler or bondo, then self- etch is a great option. Any slight imperfections and small sanding scratches will be filled with high- build primer in the next step.

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It’s also useful for painting small parts or body panels with hard- to- reach areas that you can’t scuff easily with sandpaper or a pad. Self- etching primer will get in there and bite into metal for you. Here’s an example of self- etching primer sprayed over panels with only some minor bodywork done. You’ll notice differences in color as it dries over bare metal versus body filler. This ’6. 7 convertible Chevelle at Martin Automotive was etched with 2 parts PE9. Corrosion Shield Etching Primer and 3 parts ER9.

Corrosion Shield Reducer by Sherwin- Williams. Unless you only have a few minor issues to fix, it’s challenging for us do- it- yourselfers to carve out enough time to strip the old paint to bare metal, do the repairs, apply bondo and then spray a layer of self- etching primer before surface rust begins to form on the body.

In this case, a more realistic option may be to use an epoxy primer. Epoxy Primer. As the name implies, epoxy primer gives you excellent adhesion, similar to applying epoxy glue while also sealing the bare metal from environmental elements. Since it relies on forming a mechanical bond with the metal, you have to manually create the bite it needs by sanding the entire surface of the body with 8.

Once the epoxy primer is down you no longer have to worry about rust while doing your repairs – especially since you can apply body filler right on top of it. Then simply respray the areas you worked on to re- seal them. Although it takes longer to cure than self- etch primer, restoration shops tend to favor epoxy primers because of they often handle more extensive body repair projects. An example of the application order on bare metal is: 1) paint prep solvent 2) epoxy primer 3) bodywork including filler/bondo 4) epoxy primer on repair areas or over entire car again 5) high- build primer 6) basecoat 7) clearcoat.

Recommendations. If your bare metal body is going to need some work or you’re going for a flawless finish, then you’re better off using epoxy primer because it gives you a layer that can be sanded and filled as needed. Pay attention to your product’s recoat window. During the recoat window (usually a few days) you can add filler and another coat of epoxy primer without first having to scuff the surface. If you let your project sit for a week or more, then you’ll have to sand (scuff) the original layer before you pickup where you left off. That does introduce an extra step for weekend warriors but it’s a small price to pay for being able to work at your own pace and not have to worry about rust. Did you survive your own paint job?

Which bare metal primer did you choose? Post your advice and tips!