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ANNEX C <br />TESTS FOR DETERMINING COATING CURE <br />GA 27P cure is determined by the use of the following: <br />Barcol Hardness Tester GYZJ 935 (Barber Coleman Company, <br />Rockford, Illinois) "This method, however, leaves a void in <br />the coating, therefore the tested area must be recoated to <br />eliminate this void." <br />The design of.the Impressor is such that operating <br />experience is not essential. It is only necessary to exert a <br />light pressure against the instrument to drive the spring <br />loaded indenter into the material to be tested. The indenter <br />must be perpendicular to the surface. The instrument can be <br />used in any position and in any space that will allow for the <br />operator's hand. The hardness reading is instantly indicated <br />on the dial which is conveniently divided into one hundred <br />graduations. No waiting, preloading or separate <br />measurements. On very soft materials, highest reading should <br />be used since cold flow permits springs loaded indenter to <br />continue penetration. <br />Barcol on GA 27P should ready 65-75 <br />