CoatingsPro Magazine

MAY 2016

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 33 of 84

COATINGSPRO MAY 2016 33 conditions or use of specifc application equipment. Once the coating is ready to be applied, the inspector should know the coverage that is expected from the coating, and in this case he or she should know the practical as well as theoretical coverage. From this, the inspector should be able to determine the wet flm thickness (WFT) to be applied and the dry flm thickness (DFT) of the fnal coating. With this information, the inspector can then check during the application for the thickness of the material as it goes onto the surface. With some experience, an inspector can actually determine quite accurately whether or not the material is being properly applied, even when standing some distance away from the surface. If the inspector stands in such a position that he or she can see the gloss of the coating as it is being applied, the inspector can determine if it is being applied evenly, if the passes are being overlapped properly, if there are thin spots or holidays being left, or if the material is being applied as dry spray. All of this is part of the observation process during actual application. Inspectors should also make periodic checks of the total coating thickness with a WFT gage. Tis is an easy instrument to use, and it should be used directly in the area where the coating is being applied. Te actions of the applicator (i.e., how the applicator handles the gun or the brush, the amount of coating being applied, whether or not he or she is fick- ing the gun at the end of a pass, and the gun distance from the surface) are all important observations. Te inspector can probably do more to ensure a proper application at this point than at any other point in the operation. It is at this time that the inspector should observe all application conditions very closely. Checking for Coating Imperfections Te inspector should include checking each coat for imperfections such as holidays, pinholes, runs, blistering, and overspray. If at all possible, such imperfections should be taken care of immediately prior to the movement of the applicator away from a particular area. Before the coating is dry, runs can be easily brushed out, holidays can be recoated, pinholes can be brushed, and the gun can be adjusted for overspray conditions. If the imperfections are taken care of at this point, prior to the coating being dry, a solid, uniform coating is assured. If the coating has been allowed to dry and then inspected, it is necessary to repair each of the Inspector's Corner GMA GARNET GROUP when your abrasive matters! Wr i te in Re ad e r In q u ir y #300

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