Non-Breathable Coating Caveat

Related Links:

Why Concrete Surfaces Are Prepared

Start at the End if You Want a Good Floor Coating or Decorative Overlay Job

Know the Job Specifications

Examine the Surface

Clean the Concrete

Roughen of "Profile" the Surface

Repair Surface Defects

Standards You Should Know About (ACI 503R, ASTM 4263, ASTM 4260)

What is Anchor Profile and Profile Height?

When Job Specifications and Manufacturers Specifications Differ

What Surface Condition Specifications Should Cover

Sometimes Surface Preparation and Coating Installer are Different Companies

Non-Breathable Coating Caveat

What About Acid Etching for Surface Preparation?

Architects, Engineers, Property Owners, and Other Important People: Job Planning

If shotblasting or scarifying is used to remove the top of the concrete surface to profile the concrete, this opens the pores of the concrete. Open pores means air can now more readily escape from the concrete.

If a non-breathable coating is applied, the escaping air can create air bubbles and craters in the cured coating. In this condition- multiple primer coats should be applied prior to installing the coating. Again, check with the coating manufacturer.

It may also help to apply the coating at night: there is less chance of water vapor to be drawn out into the air when the air and concrete temperatures are similar.

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