A. The equipment listed below is recommended to efficiently spray General Chemicals’ strippable Coating onto a surface.
- An HVLP or Conventional type spray gun (All gun parts that become wet shall be made of water-resistant materials such as stainless steel.)
- A diaphragm or piston pump, if the product is in drums (The diaphragm pump is recommended.)
- 25 feet of fluid hose with an internal diameter (ID) of 3/8 inches.
- Air hose of necessary length (25 ft) and having an internal diameter (ID) of 5/16 inches.
- An adequate amount of air and fluid filters.
- A sufficient number of regulators.
B. Recommended Spray Gun Settings
- Air Pressure: 35 – 40 psi (2.4 – 2.7 bar)
- Fluid Pressure: 5 – 7 psi (0.34 – 0.48 bar) for pressure pot
- Fluid Tip Size: 1.6 to 1.7 mm
C. Spray Gun Maintenance
- When the spray gun is not in use, block the spray nozzle with some form of cover or tape to prevent the products from drying within the gun.
- If it becomes necessary to clean the nozzles of the spray gun, make a mixture of General Chemical cleaner coatings remover with water. To 1 part of remover, add 6 parts of water. Flush this mixture through the spray nozzles for 1 or more minutes until the nozzles appear clean. Lastly, flush the nozzles with clean water for another minute.
II. CONSIDERATIONS AND REQUIREMENTS BEFORE SPRAYING THE COATING
Make certain to completely inspect the surface to which the product will be applied before spray operations begin.
- The surface should be as clean as possible.
- General Chemical’s peelable coating is a water base product and, therefore, the application surface should be dry for the product to properly function. If the product is applied over surface water droplets, then a complete, homogeneous coverage of the surface will not be achievable.
- The temperature of the application surface should be 45°F (7°C) or above when the coating is applied. There should be no ice or snow on the surface.
III. SPRAY PROCESS INSTRUCTIONS AND CONSIDERATIONS
A. Make certain that the operator keeps the air and fluid hoses in back of themselves to minimize interference from these hoses during the spray operation.
B. The distance between the spray gun and the surface should be set or held at a range of 8 to 9 inches. Maintenance of this distance will ensure that the product will be applied with a uniform thickness over the surface.
C. An even, steady stroke should be used while spraying; maintain the recommended spray distance by keeping the gun parallel to the surface at all times.
D. It is recommended that adequate ventilation systems be used when applying the product. Sufficient ventilation minimizes the incidence of over-sprays. The filter for this ventilation system should be made of paper or fiber.
E. Minimize back or high air flow in the spray application area. If these types of airflow occur, then the ability of the spray gun operators to evenly spray the application surface may diminish.
IV. FINAL COATING INSPECTION
After adequate dry time has passed, inspect the coating to make sure the film is continuous and homogeneous. Those factors that may inhibit proper film drying may include water droplets, ambient temperatures below 45°F (7°C), and dirt or dust particles not cleaned off of the application surface before the coating was applied.