Evaluate and classify a coating failure in the field using standardized ASTM visual rating methods

Steps

1. Identify the failure mode observed (rusting, blistering, checking/cracking, or loss of adhesion at a scribe) before selecting a test method
2. For rust breakthrough on painted steel, apply ASTM D610, 'Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces' (0-10 scale by percent rusted area and distribution pattern)
3. For blistering, apply ASTM D714, 'Standard Test Method for Evaluating Degree of Blistering of Paints' (photographic reference for blister size/density)
4. For checking/cracking, apply ASTM D660 (checking) or the related D661/D1654 series as appropriate, and for scribed-panel corrosion creep from an artificial defect use ASTM D1654
5. Photograph the failure alongside a scale reference and record the numeric/letter rating from the applicable standard rather than a purely subjective description, then correlate against exposure time, environment, and known coating system to build a root-cause hypothesis