It looks like the roof coating had bubbles when it was wet, but now that it is dry, the bubbles are broken, leaving small dimpled spots on the coating surface. What causes this?
These defects are caused by foam that is trapped in the coating while it is wet. A properly formulated coating may still have bubbles in it, but these bubbles should break and flow out smoothly so that when the coating dried, the surface is smooth. However, if the bubbles do not break quickly enough and the coating begins to dry, then they will not flow out and you’ll see these defects on the surface. In most cases, these defects will not affect the ultimate performance of the coating; they are usually just aesthetic nuisances.
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