underbody rust and treatment

Page may contain affiliate links. Please see terms for details.

boxvito

New Member
Joined
Jun 26, 2014
Messages
25
Car
Mercedes Vito 108CDI 1999
hi, my vito has a lot of quit a lot of rust underneath. As far I can tell not structural, just surface rust. I have successfully treated and removed rust from the bodywork. But from what I understand to remove the rust from the underbody, you have to; clean, remove surface rust (wire brush it), clean, treat with protective layer.

But from my experience with body rust, if you don't get the last speck of rust out, and only paint on bare metal; a few months later the rust will peep throw again.

So how does this apply to the underbody, as you can only get the surface rust off and any protective layer would just sit on the rust. And presume keep rusting.

Is it worth treating the underbody? Bare in mind, I plan on keeping the van as its low mileage and previous owners spent a fortune on the vehicle.

And what is the best method?
 
I got my car treated here-and am very pleased with the results-It wasn't a lot more than it would have cost me to diy and I wouldnt have been able to heat up the car and hot wax inject.

WE RUST PROOF YOUR CAR FROM £250
 
My Sprinter has hammerite underneath followed by Bilt Hamber dynax-UB brushed on from their tin..
 
I think you'd be o.k to attack the worst using a wire wheel on a drill/dremmel, then remove the last stubborn flecks with Bilt Hamber deox gel.

When you've got a clean, rust free surface, use zinc primer followed by something like VHT chasis and roll bar paint, and finnish it off with a stone chip paint.

When it's all fixed up, getting a proper waxoyl or similar treatment is probably a good idea. Get someone else to do this though as it's a pita to do properly unless you have a ramp, and it gets everywhere.....
 
Try here POR15 - Car Rust Remover & Treatment - Motor Maintenance | Frost Auto Restoration Techniques

Very good reviews and the silver matches the MB silver nicely.

I found POR-15 to be worse that useless.

I tried it on a number of areas on my W203, wheel arches, tailgate, door bottoms etc. Contrary to the marketing hype, the rust was back within a year. Re-treated, and same again. It is no better (or worse) than hammerite.

Mercedes rust seems to be a lot worse than any other I have encountered.
 
Denso

I use this

http://www.bucksheating.co.uk/image/cache/data/DENSO ROLL-500x500.jpg

and this

http://www.farwestcorrosion.com/med...08d6e5fb8d27136e95/p/e/petrolatum-paste-b.jpg

messy but works, rust doesnt want to be blisters/ flaky but doesnt have to be back to bare metal either to apply

either Denso alone or with paste over top, or Paste/tape/paste

paste is a grease like consistency I heat it up til liquid and spray it with proper waxoyl gun

http://www.aston-v8.co.uk/rustproofing/waxoyl-gun.jpg
 

Users who are viewing this thread

Back
Top Bottom