ASME A112.18.1 pdf download Plumbing supply fittings Note: Coating surface deformations that appear after performance testing (e.g., stretch marks, flow lines under thecoating, or deformations caused by stress relieving of the substrate) and do not separate, peel, or come loose are notconsidered cracks. Pit – a small depression or cavity. Surface defect — a pit, blister, crack, peeling, wrinkling, corrosion,...