rust proofing

[Mat01]

Not sure of the value of them but I know catapillar bulldozers have them fitted by CAT from new so I would be surprised if there wasn't some benefit and they are cat equipment . Matt

[mydmax2]

many people spray preparations onto the underside of their vehicle.
However, rarely does anyone prepare the inside of the chassis ie the structure/frame of the vehicle.
It builds up dirt and salt (if beach driven) but the vehicle only gets a wash underneath.

Parked on a steep hill and wash out of the chassis is of great benefit if interested in trying to prevent development of rust in there. The build up of crap WILL rust the chassis through.
No good having a perfect body if the bones are eaten away.

[Carlin1983]

I did as you said, I was amazed amount crap come out of the rails -