Express Prep Pro is an affordable alternative to Chlor-Rid with a formulation that is functionally & chemically identical (gas chromatographically verified). Express Prep Pro removes chloride, sulfate, and nitrate salt ions through an electro chemical reaction during surface application. Salt removal is crucial to extend coating life as soluble salts will draw moisture through protective coatings, causing them to blister and fail. These salts can also cause degradation of the substrate. Express Prep Pro is compatible with all coatings and leaves behind no residue that could complicate coating adhesion.