Pinholing


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Pinholing

In painting, a defect in a spray-painted surface caused by holes due to bubbles which persist until the film has dried. The bubbles may be caused by sealed air pockets, moisture or oil in the air lines or porous undercoating, or use of thinner that dries too quickly.
References in periodicals archive ?
3~ more readily than the resin and promotes nitrogen pinholing and can be caused by infrequent calibration or a mechanical malfunction of binder pumps.
Water: Due to the many possible sources of water, hydrogen pinholing is often a major problem.
Typically, however, only when slag enters the casting cavity can pinholing occur.
Carefully applied refractory coating and the use of isostatic pressure during casting solidification combats deformation, gas pinholing and microshrinkage.
The degree of pinholing is generally related to the amount of aluminum in the iron .