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Accordingly, what does etching do to concrete?

Concrete that hasn't been treated in any way after being poured can be too hard and smooth to accept paint or protective sealants. However, etching (or washing) concrete with acid opens the pores of the concrete and prepares the surface to accept its next treatment.

Likewise, can you etch concrete with vinegar? Etching Concrete With Vinegar A wash of an acid-based product such as vinegar can open the pores of the concrete floor. This will make the product you choose glide on and adhere to the concrete.

Consequently, is etching concrete necessary before painting?

In most cases, special cleaning and/or etching of the concrete surface will be required before painting, and the appropriate cleaner (often TSP, trisodium phosphate) and etcher (usually a solution of muriatic acid) can be obtained. These chemicals, especially the etcher, must be used with care.

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

Acid etch residue on the surface Many epoxy floors have peeled up because this fine white dust was not effectively removed before the epoxy was applied. If epoxy is applied over concrete with this fine white dust, the epoxy sticks more to the dust and not the surface.