FAQ: Protective Coatings

 

 

Vertical, Overhead and Horizontal

      • Preparation of horizontal surfaces
        is absolutely critical.    Refer to the ICRI Technical Guideline 03732 for complete information.
      • Substrate preparation is critical to the long term performance of coatings. The wall surfaces must be clean of all contaminants, including paint, dirt, dust, oose debris, oils and sealers.
      • Always apply a sample of the material to the structure to determine coverage rate and adhesion.
      • Temperature and moisture in the substrate can affect the adhesion, drying time and color of coatings.
      • Moisture in the wall is affected by direct sunlight and shade. The shaded side of the structure will most likely retain more moisture than the East and South facing sides.
      • Test adhesion after the coating has cured for 24 hours by using a knife to cut a crosshatch pattern (#).
      • Refer to ASTM D3359 for proper test procedure. Use the tip of the knife to pull the edge of the coating from the substrate. If the coating comes off over half the squares the adhesion is not adequate. If the adhesion is not adequate, apply Conpro Point 5 to a new area and then re-apply the coating. Repeat the cross-hatch test.
      • Coatings should always be applied to natural break points  in the structure. If natural breaks do not exist, determine the best place to create a break or stopping point. Once work has started do not stop until the entire area within the break points is complete.
      • Do not overlap coatings. Protect adjacent areas.
      • Always keep a wet edge. This will minimize lap marks.
      • Mix pails from different batches together to eliminate the possibility of color variation when an entire surface is visible.
      • The precise addition of water from batch to batch is critical when using colored cement coatings. Establish a consistent method for measuring liquids and mixing.
      • Over troweling of pigmented cements will affect color uniformity.

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