![]() ![]() In addition, spray booth overspray should be kept at a minimum. The goal should be to eliminate any possible sources of lint or dust, or at least minimize them as much as possible. Causes of dirt contamination can be related to poor housekeeping, including in part preparation inadequate facilities or poor painting practices. It can be prevented by consistency in paint agitation, degree of film wetness, film thickness and application procedures.ĭirt consists of any and all contaminants, including lint, dust, small clusters and overspray paint debris in or around painted surfaces. Possible causes include variations in the degree of film wetness inadequate agitation of the material low film build different application procedures different substrates different surface textures or overbake. If, or when, they break, craters are formed.Ĭolor mismatch is when several different batches of the “same” material are applied, yet the colors do not appear the same. Bubbles tend to form during a bake cycle when the top layer of paint film skins over before most of the solvent has had time to escape. Its rounded bottom and built up sides are caused by the breaking of the bubble. ![]() A crater is a small, concave, depressed area formerly covered by a bubble. When working with wood, it’s also important to manage its moisture content through temperature and humidity, as well as identify another exit route for the moisture instead of pushing up through the paint.īubbles closely resemble blisters, however, bubbles (as well as craters) once contained solvent vapor rather than moisture. To prevent blisters from forming, make sure the surface to be painted is free of contaminants and dry before applying the paint. When that moisture under the coating gets warm, it expands, and this exerts enough pressure to raise the film into a blister. With wood, they typically are caused by moisture escaping from within the wood onto its surface. With metal, they can be caused by contamination left on the surface before it is painted. Masking Solutions Provider CFS Dramatically Expands Capabilities and Capacityīlisters are small, raised areas that contain, or once contained, moisture, oil, solvent or grease. ![]()
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