Do you Rust proof your van

[frank@toronto]

I get it done at an independent place Cobra (Mississauga).

http://www.cobra1.com/

They use the thin oil inside the panels/engine bay, and a thicker oil on the underbody (~$120).

[brian_bp]

I hate undercoating, because I work on my vehicles. After years of dealing with this disgusting crap all over the bottom of our 1988 Honda CRX, I was reminded of how pointless it is just today when I tried to jack it up by the rocker jacking point to change a tire, and the jack punched the reinforced section right in. All four fenders rusted right through many years ago; the jacking point was probably long gone, too, but I had not noticed because I usually use jacking points under the middle of the front (on the subframe) and the middle of the back (at the tie-down), rather than the rocker points which the manual says to use.

[frank@toronto]

If you plan to keep you vehicle for less than 10 years, then why bother with undercoating.

It's ~$100 per treatment, and you can also choose to do it every 2 years and save some cash.

[shineysideup]

I hate undercoating, because I work on my vehicles. After years of dealing with this disgusting crap all over the bottom of our 1988 Honda CRX, I was reminded of how pointless it is just today when I tried to jack it up by the rocker jacking point to change a tire, and the jack punched the reinforced section right in. All four fenders rusted right through many years ago; the jacking point was probably long gone, too, but I had not noticed because I usually use jacking points under the middle of the front (on the subframe) and the middle of the back (at the tie-down), rather than the rocker points which the manual says to use.

I also work on my own vehicles and have been surprised at how easily some bits have come apart on my 8+ year old van with 250,000 kms on it. Like I said, I'm sold on Krown...
Messy but it works! (IMHO)