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The proper and effective preparation of a surface prior to coating is essential. Making sure that the correct roughness - or profile - has been generated is essential. If the profile is too low, the adhesion of the coating to the surface will be reduced. Too high and there is the danger that the profile peaks will remain uncoated - allowing rust spots to occur.
Elcometer have a wide range of methods for determining the surface roughness, including profile gauges, replica tape, comparators, pit gauges and the stylus method.