4. Significance and Use4.1 The pull-off strength of a coating is an importantperformance property that has been used in specifications. Thistest method serves as a means for uniformly preparing andtesting coated surfaces, and evaluating and reporting theresults. This test method is applicable to any portable apparatusmeeting the basic requirements for determining the pull-offstrength of a coating.4.2 Variations in results obtained using different devices ordifferent substrates with the same coating are possible (seeSection 10). Therefore, it is recommended that the type ofapparatus and the substrate be mutually agreed upon betweenthe interested parties.4.3 The purchaser or specifier shall designate a specific testmethod, that is, B, C, D, E, or F when calling out this standard.