12 OZ, Self Etching Primer, Prepares Bare Metal, Aluminum & Fiberglass Surfaces To Promote Maximum Adhesion & Smoothness Of The Top Coat, This Product Is Formulated To Stop Rust & Is An Essential Step To Achieve A Professionally Finished Look, Use Outdoors Or In A Well Ventilated Area Such As An Open Garage, Etches & Primes In 1 Easy Step.