Quote:
Originally Posted by jbtvt
Paint-like rust inhibitors can trap rust. They don't wick into small cracks like a thin oil and once they cure water and salt can get behind them. Some people have luck but I've seen enough failures to make me wary. What I did to mine in the link, fair amount of work but less than what you're describing here, and a lifetime coating other than touching up the bottom of my diffs every 3 years or so. Would still wire brush the loose scale - Ultimate oil undercoating guide (DIY Waxoyl)
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I had the Waxoyl treatment done to the underside of my new 4Runner the week after I bought it. They don't treat the inside of the box sections of the frame though and that's where the real issues begin. I highly recommend getting some sort of rust inhibitor sprayed inside the frame when the vehicle is new. Waiting until the rust has started to do something is foolish.
The problem with a 4Runners as opposed to a Tacoma like I came out of is that the Tacoma frame is only
partially boxed. (And guess where they rot out?) This makes coating the box sections on a Tacoma relatively easy.
The 4Runner frame is pretty much
completely boxed, so access is a bit trickier. I'm experimenting with a very different internal coating. Let's just say it's Toyota approved - for another Toyota vehicle. Only time will tell how well it works, but it's got to be better than nothing!