Provides one-step treatment that destroys old rust and prevents new rust. Just brush or spray on. Within minutes, rust is replaced by a durable black polymer coating that may be painted. Excellent protective primer. Specially formulated to be used with body filler and fiberglass. Can be used when temperature is between 50 degree Fahrenheit and 90 degree Fahrenheit (10 degree Celsius and 32 degree Celsius) and on surfaces which do not exceed 200 degree F (93 degree C). Aerosol level 2.