3M Car Care NFC Underbody + Silenc 1. Anti corrosion treatment for the underbody - this comes in 2 year and a 5 year version. The compounds used are different. . 3M™ Underbody Treatments offers you a long term solution for issues related to corrosion and rust. First, the car under body is washed and degreased. Then, the 3M™ Protective Coat is applied with Body Schutz Gold Gun (5 year Warranty) or Undershield gun (2 year warranty). The 3M™ Body Schutz/Undershield, is a hard coating on the underbody of the car, that is fast-drying, paintable, rubberized, non-toxic and chip-resistant. It also minimizes sound from underneath the vehicle and insulates against the heat and cold. The 3M™ Underbody Treatment protects the car underbody from rust, increasing the longevity of the car and thus enhancing its resale value. 2. Silencer Coating - an aluminium coating for the Silencer. It covers the entire length of the Silencer including the muffler.er Coating #3mcarcarenf # 3munderbody+silencercoating #brezzaunderbody+silencercoating #marutisuzukibrezza #3mcarcarenewfriendscolony