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I was wondering if anyone has had a full underbody anti rust treatment done at one of these specialist  places, any feedback if so?

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I looked into it but in the end did it myself,my mark 4 was only 19k on the clock when I bought it and the underside was very clean with no rust, even on the suspension components.

I put the car up as high as I safely could and with six cans of aerosol "Dinitrol" covered the whole of the working chassis. The body spray at manufacture was still good apart from two areas ;just forward of the rear wheel arch on both sides where the cill ends ,this area for some reason had no underseal applied and was body paint coated.

I did this 6 years ago and the underside is still clean and rust free and the car as now done 43k.

My mark 1 rusted from within as the rear wheel arches were suseptible to puncture with stones and subequent water ingress into the cavity between the chassis floor which went undetected until it showed .

The Mark 4 was better protected as were the other marks after the mark1.

It is an expensive operation with no guarantees that you have'nt got corrosion inside already ,Personally I would get some waxoyl and an application gun and do the cavaties yourself ,it is easy access through the under floor rubber bungs forward of the rear arches  and removing the door cill plates.

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Ahh got that Phil, I meant those with facilites (ramps etc) but going from what you say they should be OK as it seems easy to put on all over, I would think well worth doing

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MIne was fully Dinitroled as soon as I got her got her home.  I purchased the kit and got a good independent that is used to dealing with rebuilding classics as well as modern stuff to apply same. Firstly they have to remove all surface rust and use various compressed air power tools to achieve that. This is when any real rot is discovered if any. Mine was fine BTW

I had the same done to our MX5. For me if you intend on keeping such a car it is a must as it will just rot into oblivion and the only way you will find out will be on a future MOT (by a quality garage) and one of their hammers will crunch through,  when my guess is it will be mega bucks to sort it. Prevention is better than cure.

 

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2 hours ago, Wisemonkey said:

got a good independent that is used to dealing with rebuilding classics as well as modern stuff to apply same.

How much did they charge?

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Not much good for you based in London but I purchased the kit circa £150.00 and paid £300.00 for the work. Pukka Dinitrol appliers way more that nearer a grand.

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Save time and money with this revolutionary method (I know it doesn't look like it but trust me - also it's only on for a few seconds but you may find the rest of the video interesting):

 

 

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Bilt Hamber products are excellent.

I use s50 for cavities and UB for underbody with excellent results

Do it yourself , messy , smelly but easy.

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21 hours ago, Wisemonkey said:

Dinitrol appliers way more that nearer a grand

I checked out Dintrols site & they give a list of those who do the job, the price for a large car is only £550.00 for everything (wire brushing etc), sounds good to me or anyone with facilities or inclination, about 3 days.

 

'THE DADDY OF TREATMENTS' a full clean down of the whole undercarriage of the vehicle. Thoroughly cleaned and all rust eleminated by applying ML rust inhibitior to the full undercarriage. Once dry we seal the full undercarriage including chassis, floor sections, suspension arms, brake disc covers, steering bars, front/rear trailing arms, wheel carrier supports, tank/tank guard, boot floor, front/rear bumper internal supports, arch externals with black 4941 top coat. Clear coat cavity wax is then injected into the internal sections of the chassi to treat the inside out - this clear coat is also applied to the door inners and body seems before a clean off and seal to body work.

 

- Aimed at all vehicles both new and old which are looking for a one off solution to protect there vehicle both internally and externally including the door inners and body work seams -

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3 hours ago, Greer said:

I checked out Dintrols site & they give a list of those who do the job, the price for a large car is only £550.00 for everything (wire brushing etc), sounds good to me or anyone with facilities or inclination, about 3 days.

Interesting. I followed the same link to a guy in Doncaster and it was a good bit more than that.

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If you can get it done properly for £550.00 not bad.  I do not doubt your info only would suspect when they realise the size of the car, it is not a large car it is a limo the price will go up. For a large car the kit now is circa £200.00 and then you may have to add an additional tin of the anti corrosion spray to cover the vast expanse of this vehicle's underside. All that said if you want to preserve it it is worth it.

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1 hour ago, Wisemonkey said:

If you can get it done properly for £550.00 not bad

It 'probably' varies somewhat, these are individual companies located all over UK, they all use Dintrol but other than that they are not connected that I know of. The one I got the price of £550 of is the one nearest to me, it's + VAT BTW.

I'd better add this, I quoted the price of the 'full' treatment but there are 4 more levels of treatment all cheaper, I also took into account my cars age which is 20 year old

 

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