What's the best type of undercoating for an 01 Tacoma 4x4? I've been using the Rust Stop once a year oil treatment that costs about $100 for the past 3 years. I'm looking for something more permanent for use in high salt /snow areas. The frame on my 01 is showing early signs of severe corrosion despite proper care and if Toyota doesn't make it right, I want to at least TRY.
What procedures do you suggest? Would they sand blast it first to remove the old rust? Won't it just rust through any coating? Opinions appreciated.