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this book discusses the variables that affect metal coloration and offers step-by-step instructions for different application methods

Shore Hardness:  D65

Smart Coat silicone rubber If this renders unstyledSmart Coat 1K is an easy to use urethane resin sealant for all metal surfaces. Once dry, it forms a durable top coat that resists UV damage, humidity, abrasion, and corrosion. Smart Coat 1K has zero VOC, no odor, and is non hazardous. It may be thinned with water. Smart Coat 1K is terrific over polished metal, rust, and other patina finishes. It does not tend to change the color of a patina unlike solvent clear coats.