PRO Matic Stonechip Black Schutz 1 LitrePromatic us-1 is a thick,bituminous based product that is ideal for vehicle underbody coating to give both rust proofing and sound deadening properties.This product stays flexible when cured and does not sag when applied.Applies in one coat without dripping.Protects against corrosion and stonechip.Apply with a clean underseal gun or brush