Rust Check has been the #1 corrosion protection treatment in Canada & the US since 1973. We are a mineral based fluid that has added Emulsifiers, Rust Inhibitors and Lubricants to Remove Moisture and Neutralize salts. Our product is an annual application that treats the entire vehicle from bumper to bumper and top to bottom. We are "NOT" a sealant, and when moisture is present that is key! Rust Check can be applied to a rust, used and or new vehicle. Our patented capillary additives aggressively work to get into and between the smallest spaces. Our undercarriage treatment is available in our regular Amber/Clear or in our Black/Blemish cover to hide any existing and unwanted visual defects. Rust Check is "Often Imitated, Never Duplicated"!