Underbody treatment for rust and sealing, recommendations?

[Jamesh]

Just done the underside of my '05 Burstner. Given its age and mileage (just gone past 100k) it wasn't too bad. The Renault body parts were in good nick, things like wish bones and suspension mounts had surface rust but are quite substantially made. The Burstner add on's (chassis extensions etc) were galvanised but we're starting to rust in patches. Did mine with warm Waxoyl and a splash of WEO applied with a Schutz gun. Had the van on axle stands and a polythene sheet on the ground, the overspray was minimal and the plastic sheet caught it all.

My previous renault was much better built bodywork wise than my transit.

Cheers James