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I live in northern Maine where we have harsh winters and the municipalities and state road crews use a road salt to keep the ice build up down. IT rusts the hell out of your under carriage. I have owned toyota's all my life and have always done well with Dupli Color Asphault under coat or the NAPA brand asphault coat. I don't buy the rubberized stuff because it just peels off. I pressure wash the undercarriage, scrape off any loose rust flakes, pressure wash again, let dry and spray every inch of the underneath of my toyotas. It takes about 12 cans at about $8 a can for the first application. Each spring I pressure wash again and re- apply. It takes less cans each time you do it. The entire undercarriage, inside fenders, frame, inside bumpers and around all the axles is black. I have also sprayed used motor oil in the frame rails. I take my undercoating serious because if I didn't my toyotas would rust out before the motor would quit. This is a less expensive option that has worked great with me. My 1995 4runner has no rust at all under it because I started undercoating when I first got it and kept up with it each year.
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