Join Date: Aug 2010
Location: Port Elgin, Ontario
Your probably right, pressure washing more than likely takes it off the surfaces on the underbody of the truck, hence my comment about sliding under and doing quick touch ups every once and a while.
I think the real value comes from the creep factor, when it gets into all the cracks and crevices, and when it's applied inside the panels.
Driving in snow/slush/rain would have a similar effect as power washing...even though it's not at the same pressure, the underbody sees abuse from the elements a lot more frequently than it sees the power wash.
After saying all that, compared to oiling and the tar based sealers out there, I still maintain it as the preferred method of inhibiting rust.
- 6550 lb bundle of joy