Rust Bullet Concrete coatings can be applied by brush, roller, or spray equipment. If using a brush, use ones that can be discarded when the project is completed. If using a roller, use a 3/8″ microfiber nap roller. Do not use foam brushes or foam rollers. If using spray equipment, use an airless sprayer with a 517-523 size tip at 3000-5000 PSI. The best method depends on the applicator and their experience, and the application equipment. Spray application will give the smoothest, most even finish. A roller and brush combo is the most common method of application. Use a brush to do your edging and along expansion joints, and a roller for the larger areas. This method works well with two people, one using a brush and the other following behind and rolling the area in each section.