Apply directly over tightly adhered rust after only marginal surface preparation using a wire brush and/or handscraper to remove loose scale and rust particulate.
Chassis Saver bonds to blasted and rusty metal to form a rock hard yet flexible, glaze-like, non-porous finish that won't crack, chip, flake or peel
Chassis Saver Paint, Stops and Prevents Rust, Satin Black, 8 oz Can".