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I had it done on both my current vehicles at the same toyota dealer. One time application only with what looks like a yellowish, resin or wax in the engine compartment and black coating on the frame. My Frs is not winter driven but my 08 Tundra certainly is. I plan on keeping my vehicles until fall apart so I found that the dealer applied stuff (they did an excellent job) gave me a head start on my own rust prevention program.
I get underneath every spring and hose the sand/salt out of there, let it dry, then hit any rust spot with Rust Check (green can). My frame looks great, better than a 4 year old chevy that has been krowned yearly.
Have a look at a vehicle they have done and see what sort of job they did. Plus lifetime warranty. Rust never sleeps, unfortunately.
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