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.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Thus, studies attempting to determine the effect of nitrogen on pinholing might not be valid unless the hydrogen content also is known.
This produces |N.sub.2~ and N|H.sub.3~ more readily than the resin and promotes nitrogen pinholing and can be caused by infrequent calibration or a mechanical malfunction of binder pumps.
Above the eutectic composition, pinholing subsides.
Other conditions promoting oxidation also increase the pinholing situation, such as accumulation of FeO or FeSi in return sand, slag accumulation in feeders, slow pouring, elevated pouring temperatures, hot spots, aspiration and slag caused by poor gating designs and other factors less defined.
The degree of pinholing is generally related to the amount of aluminum in the iron ...