What causes bubbling, and how do I fix it?

Bubbling on a sealed surface can occur when concrete is sealed on a hot day, especially under direct sunlight. This issue is most common with stamped concrete.

When the surface temperature is too high, the sealer dries too quickly. A thin film can form on the surface while liquid sealer remains trapped underneath. As the trapped solvents try to evaporate, they cannot escape properly, which results in bubbles forming. Applying a heavy coat can make the problem worse.

In most cases, this issue can be corrected by applying a light spray of xylene over the surface. The xylene will temporarily re-liquefy the sealer, allowing the bubbles to collapse.