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| |
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Cracking
Or Crazing Of Film
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CAUSE
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REMEDY |
| A |
Excessive coating weight can cause cracks and
checks in the film when aging (first twelve months). Excessive coating
weight is not usually a problem with nitrocellulose lacquers but it is
critical when using acid catalyzed products like precatalyzed lacquers
and catalyzed varnishes. |
Use a wet mil gauge during application. Follow
manufacturer's recommendation for the number of coats and wet mil
application per coat. |
|
B |
Mud cracking. |
Occurs when latex is applied in excess film
thickness or encounters air too soon after application. |
|
NOTE: Normally 4 to 5 dry mils, after sanding is
recommended for proper coating weight. Film cracking can be identified
by cracks across grain. Cracks that run with the grain indicate
substrate cracking. |
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