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This International Standard specifies an empirical method for assessing the resistance of a coating of paint,varnish or related product to cracking and/or detachment from a metal substrate when subjected to gradualdeformation by indentation under standard conditions (see 7.1).For a multi-coat system, each coat may be tested separately or the complete system may be tested.The method may be carried out as follows:—either as a “pass/fail” test, by testing to a specified depth of indentation to assess compliance with aparticular requirement;—or by gradually increasing the depth of indentation to determine the minimum depth at which the coatingcracks and/or becomes detached from the substrate.