Rage GoldEvercoats easiest sanding body filler. The unsurpassed sanding qualities are attributed to Hattonite , a unique ingredient which reduces heat and friction created by aggressive sanding. Rage Gold also contains ZNX-7 for adhesion to galvanized steel and aluminum. Plus, its stain resistant for use with basecoat/clearcoat paints. Part of the MetalWorks System. Blue cream hardener included.