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IMO no. It is a waste of money on modern cars that are rustproofed at the factory. The body will outlast the drivetrain.

  1. I do not agree... IF you intend to keep a valuable car for a longer than a nominal 5 year period, some advice is in order. Present day cars are NOT all made to the same standards, and anyway there ARE some points where the standard "rustproofing" just start to fail: Look carefully at the bottom edge of the doors and fender panels; you will see that the drain holes are placed NOT at the lowest level but slightly above, and looking inside the door with the inner cover panel removed and a strong light will reveal that the lower union between the external sheetmetal of the door is joined to the door frame by bending the two sheets together forming a trough or channel ready to collect water and since the window seals DON'T seal well enough, dust and debris and small tree leaves will settle and become moist; in a matter of a few months the holes can no longer drain the door or fender, and corrosion slowly starts from the inside. Even when car makers apply an extra coating to this sheetmetal joint, it is the first place where severe corrosion starts in the whole car. By application of an additional rustproofing to those places the life of the car can be extended many more years than the through-hole warranty (usually 5 years, valid only when you show that the hole has gone thru all the sheetmetal thickness and paint!)
  2. I also don't agree that the engine or powertrain life is what determines if the car is all over.... An engine replacement is usually easy to do and costs much less than a complete sheetmetal restoration and paint job. You can't just buy a restoration job by mail, but you can find a lot of new engines and improvements online, and it is way easier to fix an engine or transmission compared to a full sheetmetal restoration and paint. Some cars will become even more valuable after many years, just ask any Old Mustang or Barracuda or Challenger owner what kind of prices a pristine rust-less body price can (and usually do) reach!Cost of a sheetmetal rust-through repair: up to thousands of dollars. Cost of disassembling the interior door panels and recoating the factory rust-proofing: from 20 to 120 dollars, if done on time. amclaussen.
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