Etching A Concrete Surface Does What?

What does etching do to concrete?

Acid etching involves allowing the reaction of a dilute hydrochloric acid solution with the concrete surface, then rinsing off with water. The acid chemically reacts with surface laitance1, dissolving it and allowing it and other water-soluble contaminants to be washed away.

What does it mean to etch a surface?

Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (incised) in the metal. In modern manufacturing, other chemicals may be used on other types of material.

What happens if you don’t etch concrete before epoxy?

Acid etching removes laitance, but cannot remove curing compounds or many of the contaminants found in industrial settings, such as oily deposits and water-insoluble materials, any of which can interfere with the adhesion of a coating. Improper surface preparation can result in poor bond and lack of coating adhesion.

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Is etching new concrete necessary?

The short answer is: Yes, even new concrete needs to be etched before applying epoxy or a similar type of garage floor coating. Etching is part of the concrete preparation process. Also known as concrete surface profiling, the process of acid etching opens the pores of the concrete and creates a rougher surface.

How long should concrete dry after etching?

After all the water has been removed, the pad should have at least 48 hours of drying time before you apply any etching to the surface. If the weather is particularly humid, wait up to 72 hours for best results.

How soon can you paint after etching concrete?

Sealer or Paint Applications



Sealers range from 24 to 72 hours as a general rule, while epoxy paint applications to the etched areas of the concrete can take up to 10 days to dry in humid conditions.

What is the purpose of etching?

Etching is used to reveal the microstructure of the metal through selective chemical attack. It also removes the thin, highly deformed layer introduced during grinding and polishing. In alloys with more than one phase, etching creates contrast between different regions through differences in topography or reflectivity.

Can you use vinegar to etch concrete?

EtchingVinegar’s ability to dissolve CaCO3 will dull your marble, travertine, concrete and terrazzo surfaces. It may “clean” the surface but it is also dissolving pits into the finish and effectively dulling it.

What is the best way to etch concrete?

Muriatic acid, also known as hydrochloric acid, is the typical acid of choice when etching concrete. It is inexpensive and a dangerous chemical that can damage almost anything it comes in contact with.

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Can I paint concrete without etching?

If the texture is similar to medium-to-rough sandpaper (150 grit is a good guide), you probably don’t need to etch, although it certainly wouldn’t hurt. If the surface is smooth, definitely etch. However, the etching step needs to come after you clean the concrete.

Can you paint over dirty concrete?

Paint won’t bond well to dirty, rusty or oily spots, and untreated stains can seep through the finish. Give the concrete a good scrub using a stiff brush and a trisodium phosphate solution or other degreaser and strip old, flaking paint with a wire brush.

Do I need to prime concrete before painting?

Generally speaking, priming is so essential to successful painting outcomes, concrete will always needs a primer. However, the existing surface needs to be primed before painting if: It is unpainted. It is peeling.

How long do you leave muriatic acid on concrete?

Use a brush or sprayer to apply the acid directly over the stained area. Surround the area in question with a neutralizing agent. Leave the acid on for twenty minutes, then scrub. Repeat if needed.

Do I need to prime my garage floor before painting?

If you are planning to also paint your garage floor, applying sealant can act as a primer. Priming prior to painting can help achieve better adhesion if moisture is an issue or if the concrete is dusty and “weak.” If you’re going to paint the garage floor, allow the sealant/primer to dry thoroughly (at least 8 hours).

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