Clean the Concrete
Related Links: Why Concrete Surfaces Are Prepared Start at the End if You Want a Good Floor Coating or Decorative Overlay Job Clean the Concrete Roughen of "Profile" the Surface Standards You Should Know About (ACI 503R, ASTM 4263, ASTM 4260) What is Anchor Profile and Profile Height? When Job Specifications and Manufacturers Specifications Differ What Surface Condition Specifications Should Cover Sometimes Surface Preparation and Coating Installer are Different Companies What About Acid Etching for Surface Preparation? Architects, Engineers, Property Owners, and Other Important People: Job Planning Remove all chemicals, oil, and grease from the concrete first. Curing compounds, oils, grease, chemicals, or other contaminants should be removed.
Chemicals and oils are often removed with high-pressure washing. Dirt and grime can be removed with a degreaser worked in with a floor polisher. Shotblasting is often used to clean the floor- a benefit with this method is that it "profiles" the floor to receive the bond coat at the same time the floor is cleaned. A "water drop" test can be used to determine if a surface is clean. Water beads on surfaces contaminated with sealers, curing compounds, oil, and grease.
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