Choose a location that can be observed clearly, protect surrounding surfaces, and document the condition before any test step. Compare the area at close range, then pause if the substrate identity is uncertain. A final test-area sketch should define exactly what was checked while keeping observations separate.

related Compatible detail adhesion testing Guide detail adhesion testing should use a small check area that represents the actual roof detail without turning the test into a broad application. Keep substrate type, existing finish, nearby seams, and drainage features visible, and avoid assuming that two adjacent materials will behave the same.