How do I find high spots before the ceramic coating cures?

Inspect each section immediately after leveling, before moving on to the next. Use a strong, focused light such as a detailing inspection light or a phone flashlight, and look at the panel from several angles, because high spots often only show at a low viewing angle. Overhead garage lighting alone tends to hide them. Pay extra attention to edges, curves and lower panels, where product is easily left behind, and to dark colors, which reveal unevenness more clearly.