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How To Prevent Silver Powder-Coating Finishes From Tarnishing

Silver powder-coating finishes include HotCoat's New Smoke Chrome and Argent Silver Base Coat. To prevent these powder-coatings from tarnishing, a topcoat is necessary. For best durability, topcoat with Gloss Clear, or one of HotCoat's® translucent colors. Only topcoat the completely cured base coats. (Thorough cure is achieved by leaving parts being coated in a 400°F oven for 15-20 minutes after flowout occurs.) In the case of Almost Chrome, if it is not thoroughly cured it will turn into a battleship gray color when the topcoat is cured.

Allow the part to cool before topcoating. It is normal for the topcoat to slightly diminish reflectivity. To minimize this loss, only apply enough topcoat to hide the color of the base. To prevent the Gloss Clear from yellowing, prop the oven door open about 1/4" while curing to enhance air circulation. If you're having trouble applying the topcoat, make sure that the ground clip is making direct contact with the metal part, that the emitter tip of the gun is clean, and that there is 1-1/2" to 2" of powder in the cup.