Rage OPTEX with color-changing technology is an ultra-premium body filler that helps body shops save time and money on every repair. There’s no second guessing-once mixed with cream hardener, OPTEX changes color to indicate the repair is ready to sand. Formulated with Evercoat’s patented ECORESIN technology, OPTEX offers superior adhesion to a broad range of substrates and unparalleled sanding properties. OPTEX is also part of the Metalworks System that guarantees the repair to maintain the O.E.M. corrosion warranty on original factory corrosion protected sheet metal and galvanized sheet metal when used in accordance with the application instructions.