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Aged Uncoated Concrete

Must be dry, clean and free from oils, fats or greases. Degrease or scrub with detergents if necessary. The concrete must be free from any incompatible additives or curing agents. Acid etch or abrasive blast clean.

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Previously Epoxy-coated Concrete

Remove loose dirt, dust and paint by sweeping or vacuum cleaning. Remove grease, oil, floor compound wax and other contaminants. Caustic soda treatment must be used on areas covered with a build-up of grease and/or soap scum. Heavily contaminated areas may require further removal by mechanical methods. If the floor is very old and completely saturated with oil, no cleaning method will completely remove the oil. In this case, try a small area and apply a sample of the system before cleaning the entire floor. Very glossy or hard coatings should be lightly sanded to ensure maximum adhesion. Concrete floor areas that require patching should be free of dirt, oil, grease and other chemical contaminants. A test patch is recommended for use over existing coatings.

Steel

Remove all loose rust, dirt, moisture, grease or other contaminants from the surface. Power-tool clean SSPC-SP3 or hand-tool clean SSPC-SP2. For more severe environments, dry abrasive blast SSPC-SP7. Water blasting is also acceptable.