What Is Etching?
Etching is a surface preparation process that opens the pores of concrete so a coating can bond more securely. A mild acid solution reacts with the top layer, creating a fine texture. The surface is then rinsed and allowed to dry before epoxy or another coating is applied.
Quick Facts About Etching
Category
Concrete surface preparation
Used for
Improving coating adhesion
Common confusion
Not the same as pressure washing
Also called
Concrete Etching, Acid etching
Often discussed with
Garage Floor Epoxy Coating
Key Takeaways About Etching
- Etching changes the concrete surface, not the coating itself.
- Clean, dry concrete helps the process work as intended.
- Etching isn't the same as simply washing the floor.
How Etching Works
Etching uses a mild acid solution to react with the surface of cured concrete. The reaction opens small pores and creates a light texture. That texture gives a coating more surface area for bonding.
Related glossary terms: Surface Preparation, Paint Adhesion, Epoxy Primer.
Before etching, the floor must be free of oil, dirt, paint, and other residue. After the solution works, the surface is rinsed well and checked for leftover dust or residue. Concrete preparation also includes allowing the slab to dry before epoxy coating is applied.
Etching works best on clean, absorbent concrete. A sealed or heavily contaminated floor may need another preparation method. The right method depends on the slab's condition and the coating system.
From the Thomas J. Painting team
When we prepare a garage floor, we check whether water can enter the concrete surface. We remove residue before etching, then inspect the slab for remaining dust, weak areas, or moisture. We only move forward when the surface is clean and ready for the coating system.
Etching in Practice: A Real-World Example
A homeowner has a bare concrete garage floor with light dirt and oil residue. The floor is cleaned, etched, rinsed, and dried so the epoxy coating has a properly prepared surface.
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Related Terms
Surface Preparation
Surface Preparation is the planned cleaning, repair, sanding, scraping, and priming of a surface before paint…
Paint Adhesion
Paint Adhesion is the bond that holds a paint film to its surface. Strong adhesion helps…
Epoxy Primer
Epoxy Primer is a bonding coat applied before epoxy to help the coating stick to a…
Film Thickness
Film thickness is the depth of a coating after application or drying. Painters use it to…
Thomas J. Painting
Have Questions About Etching?
Contact Thomas J. Painting for practical guidance on Etching and related painting contractor work in Bellevue.