Best rust proofing product for your vehicle depends on age of vehicle, climate, and whether you prefer annual oil spray or long term hard coating. For annual oil based protection that is best for old vehicles and salty rust belt climates because it creeps into seams, displaces moisture, and does not trap rust, top products are Fluid Film, Krown, NH Oil Undercoating, Woolwax, and Corrosion Free, all lanolin or wax based that need yearly application costing 120 to 200 dollars professional and are highly effective at slowing rust. Fluid Film and Krown are most popular and well reviewed for creeping ability. For hard rubberized or polyurethane coating that provides physical barrier against stone chips and lasts longer 2 to 10 years, best products are 3M Professional Grade Rubberized Undercoating, Rust-Oleum Rubberized Undercoating, POR-15, and Dinitrol for cavity wax. POR-15 is excellent for restoration on bare metal after rust removal. For new car with clean underbody wanting long term low maintenance protection, polyurethane or 3M rubberized is best. For used car with some rust in salty area, oil based annual spray is best because hard coating can seal in moisture over existing rust. So best overall for most drivers in winter salt areas is Fluid Film or Krown annual oil spray, best for new car long term is 3M or polyurethane.
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