Hmm, that doesn't sound right, Joe. For best results with Rust-Oleum Specialty Stone Spray, make sure to remove all dirt, grease, oil, salt, and chemical contaminants by washing the surface with a commercial detergent, or another suitable cleaning method. Rinse with fresh water and allow to thoroughly dry. You'll also need to lightly sand glossy surfaces to create a surface profile for the paint to adhere to. - Rust-Oleum Product Support 5