Like you people understand, it's about where and when you plan to drive the rig. As for us with our PC here near Chicago, it has never seen snow or salt and rarely sees rain, so it's in good shape underneath. I have wondered if there will come a time when I should brush on a coat of POR-15 or similar product on surfaces I can get to.
Our first motor home (that little Toyota I talk about sometimes) we had it rustproofed by Ziebart when it was brand new in the fall of 1983. They drilled so many holes and then plugged them with black plastic plugs on our white chassis. It was a bit heart breaking to see that. Then there was the cleanup from the black waxy substance in places it should not have been. I was disappointed about that too. Still, to maintain the warranty, I had to bring the motor home back every year for an inspection. With each annual visit, they kept adding more goop. After the 3rd or 4th year, I said "that's enough" and never returned. I just couldn't take the mess they kept making. And the goop had gotten so thick in places. It had me wonder how to get to some bolts and such if I needed to.....dig them out of 1/4" thick black waxy goo?
We owned that motor home for 24 years. As the years went by, that thick waxy stuff hardened, cracked up, then warped in places where it resembled black potato chips. I then wondered if the salt from winter driving was getting stuck in those places. I never did deal with a serious rust problem (just non-evasive surface frame rust), so I suppose Ziebart did more good than harm.
But I just couldn't see putting our PC through all that. I'd rather torture myself just one time, crawling under the PC with a can of POR-15, brushing it on where appropriate, and just as important to leave the wiring and the rest, free of anything like that.
