Most waxes are mainly Silicone based and last only a couple weeks depending on heat, car washes, and rain. Plus Waxes have no warranty against Acid Rain, Tree Sap [...]

In most vehicles sound noise can be reduced up to 30%

No we do not.  Rustproof is applied through drain holes and factory plug holes, however we  lower spare tire to get behind area in Trucks and SUVS.

Below window lines, for example: doors, fenders, hood, tailgate or trunk, undercarriage except moving parts ,heated areas , and plastic.

Manufacturer's warranty covers rust hole do to defect in material.  Most manufacturers warranties specifically exclude road salt and don't cover surface rust at all.