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Cleaning Surfaces of Contaminants for Gage Bonding Bonding the gage directly to the surface of the part, member, or structure is generally desirable. Surface coatings, including paint and metal plating, are usually detrimental to the measurement results. These coatings should be removed if possible. Grinding to remove permanent coatings. Degreasing is performed to remove oils, greases, organic contaminants, and soluble chemical residues. It is usually performed prior to abrading operations which may drive surface contaminants into the surface material. Porous materials, such as cast iron, may require heating to drive out absorbed contaminants.   Page 2 of 4