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E <br />FANNAM <br />11 <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 experience <br />is not essential. It is only necessary to exert a light pressure <br />against the instrument to drive the spring loaded indenter into <br />the material to be tested. The indenter must be perpendicular to <br />the surface. The instrument can be used in any position and in <br />any space that will allow for the operator's hand. The hardness <br />reading is instantly indicated on the dial which is conveniently <br />divided into one hundred graduations. No waiting, preloading or <br />separate measurements. On very soft materials, highest reading <br />should be used since cold flow permits springs loaded indenter to <br />continue penetration. <br />