Non-Breathable Coating Caveat

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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