Cadillac vehicles are designed and built to resist corrosion. All body and sheet metal components are warranted against rust for 4 years or 50,000 miles, whichever comes first. Any sheetmetal that actually rusts through, causing an actual hole in the sheetmetal, is covered for up to 6 years, unlimited miles. Application of additional rust-inhibiting materials is neither necessary nor required under the Sheet Metal Coverage. Cadillac makes no recommendations concerning the usefulness or value of such products. Application of after-manufacture rustproofing products may create an environment which reduces the corrosion resistance built into your vehicle. Repairs to correct damage caused by such applications are not covered under your New Vehicle Limited Warranty. See your Cadillac dealer for terms of this limited warranty.