Taking Care of Products with Powder-Coated Finishes
Powder coating in not impervious to harsh solvents and many commercial cleaning solutions will damage these finishes. This damage accelerates staining, fading and ultimate failure of the powder coated finish. Cleaning with such chemicals can cut the life expectancy of the finish in half. Proper cleaning and maintenance may more than double or triple the coatings effective service life. Fabricated products that require the greatest decorative and protective value will require some sort of proactive maintenance and care. For high visibility projects such as architectural building applications it is wise to document and maintain records of the maintenance including the exact cleaning procedure, materials and frequency. These records may become useful in the event the finish fails to perform as expected.
Avoid using unfiltered tap water or ground water when cleaning the powder coated finish, and pay attention to where the wind blows the water from sprinkler systems. Unfiltered water often causes staining on outdoor products due to sulfur, iron oxide, chlorine, fluoride, and other minerals commonly found in hard water or ground water in certain states. Only filtered water should be used to clean and rinse powder coated products whenever possible.
Clean with Mild Soap and Warm Water
Products that have been powder coated should be cleaned with a soft brush or cloth, using mild soap and very warm water. Soaps that have emulsifiers that break down common stains and are scum free are the best to use. The exposed surfaces of powder coated products that are most critical should be cleaned weekly or bi-weekly. Simply wipe down the top surfaces and rinse with filtered water (not hard water). (Reference AAMA 610)
Commercial Cleaning Solutions
It is a common misconception that solvents, and other petroleum based chemicals, are good cleaners for powder coated surfaces. Not true. These chemicals can be very detrimental to the organic polymer based finish. They may clean well for a time, but they clean by removing micro layers of the finish. After a while, it becomes impossible to clean the surface using this method. Additionally, the coating surface may become stiff and hard, and lose its barrier protective value. Compounding this problem the coating may begin to crack and prematurely lose gloss and fade the color. Physical aging of organic coated surfaces that are constantly exposed to weathering conditions is an inescapable process that is accelerated by the use of harsh chemicals.
Wax the Exposed Surface
Just as your car benefits from semi-annual applications of wax, so will the finished surfaces of products such as outdoor furniture, outdoor lighting fixtures, stairways, handrails, guardrails, and fences. Lightly wax the coated surfaces with a high grade, non-abrasive car wax that contain U.V blocker and/or U.V. inhibitors. Do not use compound waxes that contain abrasives and be sure to wipe off any residual wax. Wax that may remain on the coated surface could bake on in the ultra violet light from the heat of the sun and cause permanent staining.