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May 01, 2024

Substrate Coverage Rate & Spray Application Guidelines of Pecora ProPerm VP

For this month’s blog post we examine the substrate coverage rate and spray application guidelines of Pecora ProPerm VP.

Spray Coverage Rate Guidelines

Our ProPerm VP is a low mil, water-based fluid applied coating for use on a variety of common building components. Differences in coverage rate can be expected due to the varying degrees of porosity found among common building components. The amount of substrate absorption in combination with inherent volume shrinkage will ultimately dictate the coating coverage rate and dry film thickness (DFT).

Pecora recommends a coating dry film thickness (DFT) of 7 – 12 mils applied in a single coat.

The Pecora Technical Service Group has evaluated a variety of common building components for coverage/absorption rate. All coatings were applied and cured at standard laboratory conditions. The following results were obtained:

Spray Application Guidelines

Spray Equipment Requirements (>60°F Ambient Temperature)

  • Electric-Powered or Gas Hydraulic Airless Sprayer
  • Recommended airless spray tip: RAC (Reverse-A-Clean) type
  • Tip size: 517 (10” fan / 0.017” orifice)
    • Tip sizing can vary and will be dependent on the product temperature/viscosity, desired fan width, and flow rate of pump. Tip sizes can range from: 517 to 625
    • Wider fan patterns and larger orifice sizes will require higher flow rates.
  • Fluid suction hose – DRUM ONLY
    • Hose will be attached to inlet suction tube in order to siphon coating from 55 gallon drum containers.

Spray Equipment Requirements – Low Temperatures (<60°F Ambient Temperature)

  • Electric-Powered or Gas Hydraulic airless Sprayer
    • Suggested models include, but not limited to, the following:
    • Minimum operating pressure: 2000 PSI
    • Material Conditioning: minimum 65°F
      • Material should be stored in a conditioned space prior to use, if feasible. Drum or plastic pail heater bands may be used during the spray application in order to maintain minimum coating temperature (65°F).
    • Minimum flow rate (delivery): 35 GPM
    • Hose Diameter: 3/8” or ½” (1/2” hose diameter is recommended with >25 ft hose lengths)
  • Recommended airless spray tip: RAC (reverse-A-Clean) type
  • Tip size: 517 (10” fan / 0.017” orifice)
    • Tip sizing can vary and will be dependent on the product temperature/viscosity, desired fan width, and flow rate of pump. Tip sizes can range from: 517 to 625. Wider fan patterns and larger orifice sizes will require higher flow rates.
  • Fluid suction hose – DRUM ONLY
    • Hose will be attached to inlet suction tube in order to siphon coating from 55 gallon drum containers.

General Spraying Guidelines

  • Spray gun should be held approximately 12 inches from the substrate surface.
  • Spray gun should be held straight at the surface. Fanning of gun will cause an uneven mil thickness.
  • Move the spray gun at a smooth, steady rate. Increase rate if coating is too thick, decrease rate if too thin.
  • Spray at lowest pressure required to atomize coating. Slowly increase pressure if fingers/tails are evident in spray pattern.
  • 30 – 50% overlap with each pass to ensure total substrate coverage.
  • Periodically measure coating thickness with a mil gauge to ensure proper coverage is being achieved.
  • REMOVE SCREENS PRIOR TO SPRAYING. Screens are typically located in spray gun handle and pump manifold.

Cleaning & Purging

Pecora recommends water for purging all pumps and components as well as cleaning of any tools. Pumps and components should be purged prior to and after spraying the coating. Purging is required at the end of the each workday. Do not allow the coating to dwell in the pump and components for extended periods of time. During any breaks in the workday, it is good practice to protect the spray guns and open pails/drums from ambient moisture by wrapping the spray gun and temporarily sealing any open containers.

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