Corroded steel that is heavily contaminated may require additional cleaning, e.g. steam cleaning or high pressure fresh water washing, before surface preparation starts.Oil or grease should be removed in accordance with SSPC-SP1 solvent cleaning.Sand blast clean to Sa2.5 (ISO 8501-1:1988) or SSPC-SP10 with a sharp angular profile of 50-75μm (2-3 mils) depth. If oxidation has occurred between blasting and application, the surface should be re-blasted to the specified visual standard. Surface defects revealed by the blast cleaning process, should be ground, filled, or treated in the appropriate manner.All surfaces to be coated should be clean, dry and free from contamination. Prior to paint application all surfaces should be assessed and treated in accordance with ISO 8504:1992. For unapproved shop primer, sand blast to remove completely.If the surface is pitted or rusted, fresh water wash is required after blasting, then re-blast the entire surface to make sure soluble contaminations must be absolutely removed.
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