Underbody protection - Renault Forums :: Independent Renault forum

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post #1 of 7 (permalink) Old 18th February 2012 Thread Starter
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Underbody protection

Do people still apply underbody protection and is it worth doing?

My last car was over 12 years old and was still ok ,bodywork looked 3 years old , but it was rotting from the inside out.
Sills v bad (covered by the original plastic body mouldings).
Rear chassis panels and sections were getting rotten,.2 -3 layers of flaking rust.
Wheelarches,the metal part were starting to bubble thruat the edges where the metal bends into a lip.

No aftermarket protection was ever applied, and it was reasonably looked after and garaged.

You might say , after 12 years, what u expect but.

Are things like waxoyl still being used for injection spray into body cavities?
That didnt sound right.
I mean products like waxoyl for spraying into box sections/sills on cars.

Bitumen undercoats?

Im thinking as well of all those little components like brake pipe holders that seem to be very thin metal spot welded onto suspension bars etc..

Wheel arches , the bit that isnt protected by the plastic spray guard,the lip.
Is there nyway to prevent road crud collecting there?

Or is it just not worth it..Rely on the renault 12 year guarantee and get the bodywork thing done and stamped every year?
I suppose that means your locked into main dealer servicing and repairs as long as you keep the car.

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post #2 of 7 (permalink) Old 18th February 2012
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Re: Underbody protection

dont really think its worth it these days on modern cars, they dont really go rusty if well looked after, i guess if u were mad for cars and wanted to keep it in A1 condition, u could get it waxoyl, but carnt see the point personally
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post #3 of 7 (permalink) Old 18th February 2012
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Re: Underbody protection

I would say it depends on the car, and how long you expect to keep it.

If you read the forums as much as I have, you'll notice that with the exception of rust around Clio fuel filler caps - Renaults don't really rust.

The other way to view that info, is that they get scrapped for other reasons (i.e. mechanical or electrical reasons).

I underseal my older cars, mainly as prevention is always much cheaper than cure, but modern cars (like the merc) have so much plastic shielding to remove, its not worth the hassle - plus knowing the OH, we won't be keeping it until its over 40 year's old...



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post #4 of 7 (permalink) Old 18th February 2012
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Re: Underbody protection

if you use a jet wash then yes waxatol inside the sections is worth it as a jet wash is well known for forcing water into areas that will start the rust process
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post #5 of 7 (permalink) Old 18th February 2012
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Re: Underbody protection

if you have a pre 02 car, then its worth getting done, as well as inside the door panels/inner rear arches with waxoil.

post 02 they are more thoroughly waxoiled at the factory, so they are corrosion warranted upto 12 years.

theres no harm getting the underbody treated on a regular basis though.
also make sure all rubber grommets are in good order where they are fitted to box sections of the chasssis.

the most inportant thing is that the car must have all factory fitted splash guards firmly secured in place, if any are missing then water will get into the wiring connectors and loom (which is more than enough to finish off a car)
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