Probably not for vehicles that are already experiencing rust. If I were you i'd get that old undercoating scaped off and get some heavy duty rust coating put on by through after market. This is an investment and as with an investment you want it to keep it's value. Can't think of a better way to prevent rust other than getting new under coating that will last for the life of the vehicle. Not the cheap under coating that GM had decided to use on the H2. Check 3M I believe they make under coating.
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