As in the title, what can we do as a preventive measure? I've looked at mine & on close inspection I'm sure I can see it & im thinking I want to do something now to stop it. 2004 RR 4.4 V8 Autobiography

Fill the bottom with something like this



I find it better than waxoil as it's very thin and gets everywhere....

You can buy it in an aerosol...

Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
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Just don’t spray it in when the tailgate is open then, close it Runs out the drain holes & goes everywhere

Ask me how i know

To be fair Waxoyl is cheap and works ok.

But i've switched to dinitrol as my preferred product, as it's a proper 'system', and much easier to work with, especially in the cold!

Does it set like waxoyl? Craig you say not to do it with tailgate open then close, are you saying leave it open till it sets? 2004 RR 4.4 V8 Autobiography

Sort of, it skins over, which means its more resilient. Waxoyl eventually dries out and needs re-treatment after a few years.

They do a complete system though. ML if i remember correctly is the really runny one. Then 3125 is the slightly less runny one. They go right up to quite thick stuff that you can spray in wheel arches and it doesn't wash off.

Dinitrol is what most of the car manufacturers use.

Don't get me wrong waxoyl does the job and it's cheap. But it's very much an amateur use product. I used to swear by the stuff, but once i tried Dinitrol i've never looked back. No standing the can in a bucket of hot water on a cold day because it's gone too thick, no adding white spirit because it's been in the garage a while and it's gone pretty much solid in the can. And you don't have the stuff dripping out of the doors on the first hot day of the year.

Answered above

I did this, my thinking was you want it to set in the bottom and the drain holes to be clear. So I sprayed liberally whilst open (you can't really do anything else) and closed after having taped paper (I used old wallpaper) over the lower tailgate and bumper (under where it would drain out) and then parked in the street so the Dinitrol didn't drip on my drive.

I know thats selfish and thoughtless but hey ho  Geoff

Would it not be possible to spay with the tailgate shut.... maybe with the lower tailgate open and some well placed rags / buckets / FREE PAPERS (at last a use for the bloody things ). and to gain access, maybe entry from the rear door with a seat down?

At least you wont be rust proofing the street  Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!