When applying liquid-applied roof coatings, proper technique is critical. Failed roof coatings often result from improper application or incompatible materials. You must also confirm that the coating is compatible with the existing roof surface to avoid failures.

In this example, an elastomeric coating was installed over an asphalt-based emulsion. This method is acceptable, but only if the emulsion has fully cured and all oils have burned off. Otherwise, you are risking failed roof coatings.

Applying a coating too soon—before the emulsion cures—causes major problems. The bond will fail over time. Cracking, peeling, and adhesion loss will follow, just like you see in the image. These are clear signs of failed roof coatings.

Because the installer skipped proper curing, the homeowner now faces a full roof replacement.

To avoid costly mistakes, always follow manufacturer guidelines and industry best practices.