Quart– Rust Bullet DuraGrade Clear is a high-performance, ultra-low VOC, rust inhibitive, protective coating. With just 49 g/l of VOCs, DuraGrade Clear’s patent pending formula is an environmentally preferred ultra-low VOC coating compliant in every state and air quality management district. DuraGrade Clear can be used as a standalone coating or as a top coat and can be applied directly onto clean or rusted metal, concrete, wood and other surfaces.