This page has been edited 48 times. The last was made by - gheuer gheuer on May 19, 2015 10:46 am GMT


12.1 Spray Guns

Considerations

  • Pre-Operation Checklist is a prerequisite for ANY operation.
  • These standards are written as generic to spraying technique with a hand-held spray gun. Specific variances may exist for Conventional, HVLP, Gravity, and Air-assisted Airless equipment.
  • Spray gun, spraying environment and related accessories are optimal.
  • Spray material is properly thinned with consideration for temperature and humidity (Refer to Viscosity Cup standards).
  • Safe practices are followed for handling finishes in accordance with Material Safety Data Sheets (MSDS).
  • Required OSHA approved personal protective equipment is worn.
  • Required OSHA engineering controls (example, spray booth) are in place and operating.
  • Lock-out/Tag-out procedure is in place and followed.
  • Process is completed in a timely manner.

Pre-Operation Checklist

Level 1

  • Verifies proper viscosity and temperature of coating.
  • Verifies atomization and pattern balance with flood test on vertical paper panel.
  • Verifies that trigger is functional and nozzle tip and ports are clean.
  • Verifies operator has free movement through the spraying motions required and that hoses and pots are unobstructed.

Level 2

  • Interprets Product Data Sheet and adjusts fluid viscosity as required.
  • Selects and installs appropriate air cap and fluid needle and nozzle.
  • Adjusts air and fluid knobs to achieve optimal spray rate and fan pattern.
  • Thins, mixes and filters finishing product.
  • Replenishes fluid pot as required.
  • Inspects all gauges and adjusts regulators and valves as needed.
  • Meets Level 1 performance standard.


12.1.1 - Spray Clear or Opaque Coatings on Horizontal & Vertical Surfaces

Level 1

Given a properly prepared product and properly adjusted spray equipment, apply one seal coat and one top coat at a target wet mil thickness on two 36" x 24" (915 mm x 610 mm) finish sanded, close-grained, hardwood plywood panels - one panel laying flat, one panel vertical.
Performance Standard -
  • Wet film is uniform and of acceptable (specified) thickness.
  • Laps fan pattern 50% to achieve even surface coating.
  • Holds spray gun at correct distance 6" - 8" [150 mm - 200 mm] and perpendicular to work surface.
  • Applies fluid to work surface with smooth, parallel, continuous strokes.
  • Seal coat properly sanded and prepared for top coat.
  • Surface is free from orange peel, pebbling, streaking, sagging or other overspray defects.
  • Top coat exhibits a consistent sheen.

Level 2

Given a properly prepared product, set up the spray equipment and apply one seal coat and one top coat at a target wet mil thickness on two 36" x 24" (915 mm x 610 mm) finish sanded, close-grained, hardwood plywood panels - one panel laying flat, one panel vertical.
Performance Standard -
  • Meets Level 1 performance standard.


12.1.2 - Spray Toners (Dye or Pigmented translucent coatings)

Level 1 - N/A

Level 2

Given a properly prepared product, set up the spray equipment and apply toner at a target wet mil thickness on two 36" x 24" (915 mm x 610 mm) finish sanded, close-grained, hardwood plywood panels
Performance Standard -
  • Wet film is uniform and of acceptable (specified) thickness.
  • Laps fan pattern 50% to achieve even surface coating.
  • Holds spray gun at correct distance 6" - 8" [150 mm - 200 mm] and perpendicular to work surface.
  • Applies fluid to work surface with smooth, parallel, continuous strokes.
  • Starts & stops stroke at the beginning and end of each pass so as to properly coat panel without wasting material..
  • Seal coat properly sanded and prepared for top coat.
  • Surface is free from orange peel, pebbling, streaking, sagging or overspray defects.
  • Consistent sheen and surface reflective quality is achieved.
  • Leaves gun in a clean condition.
  • Meets Level 1 performance standard.


12.1.3 - Spray Complex Surfaces (Cabinet Assemblies, Furniture)

Level 1 - N/A

Level 2

Given a properly prepared product and spraying facility, set up gun and accessories for and apply a clear spray finish to the inside and outside of a 5 sided MDF box, or equivalently complex assembly, (approx 24"h x 24"w x 16"d), with one seal coat and one top coat.
Performance Standard -
  • Wet film is uniform and of acceptable (specified) thickness.
  • Laps fan pattern 50% to achieve even surface coating.pan st
  • Holds spray gun at correct distance 6" - 8" [150 mm - 200 mm] and perpendicular to work surface.
  • Applies fluid to work surface with smooth, parallel, continuous strokes.
  • Surface is free from orange peel, pebbling, streaking, sagging or overspray defects.
  • Consistent sheen and surface reflective quality is achieved.
  • Leaves gun in a clean condition.
  • Meets Level 1 performance standard.