Additional Details ------------------------------ Product description: TeRust Rust Remover Tenax has created a rust stain poultice powder! TeRust Rust Remover Powder is designed to remove rust stains out of granite, marble, travertine, limestone, terrazzo, concrete, brick, and sanded grout. TeRust contains a special blend of chelates for removing rust stains from stone. By utilizing the stain process reversal technique, the TeRust Stain Remover Powder draws the stain out of the stone. Directions: Scoop out the needed amount of powder. Apply water to make a toothpaste consistency and cover with plastic wrap and make several toothpick holes in the plastic wrap. Within 24-48 hours after the powder has dried, remove the poultice and the stain will be gone! Just try this product once and you will see why Tenax is an undisputed industry leader. NOTE: Calcium based stones may etch and require repolishing. It is also recommended to reseal the stone afterwards. This is a HazMat (hazardous material).