Primer is made to provide adhesion to the bare metal or plastic of your vehicle. Dispenses from a convenient and safe glass touch-up bottle with screw on lid. Features a built in touch up brush on the screw top. This product is an easy way to touch up nicks and scratches. Bottle fits on most air brush guns if needed. This product is applied before your basecoat/clearcoat finish. Primer is only needed is the repair is down to the substrate.