Chassis protection

After a little advice from my betters, please.
Having finally rebuilt the '87 90 and now using it as my daily drive, I need to do the chassis. Where it was left standing for three years it's developed light surface rust but luckily it was left on gravel, not grass, which probably saved it.
So, it'll run all winter and I don't have a garage, thus thinking about the chassis. I'm near Frog Island, who told me today they'll do it with something called Dynatrol. They say this is what the military use and it forms a much tougher seal than Waxoiling the thing. Also said the stories about sealing in moisture were fiction - they'd steam clean and tape it on day one, seal it on day two, let it dry on day three and I could take it away that night. Said it'll harden further over the following days but it's fine to use.
Anyway, they charge £450 for this all in, which seems reasonable.
Any advice about any of this guys? Particularly keen to get to the truth of this thing I've been told about sealing in moisture and thus accelerating corrosion. Been told (admittedly in the pub) that you need to leave a vehicle for at least a week somewhere warm and dry before doing it.

Tricky one. The before and after bloke used a drying booth before wax oil but I'd never recommend him.

Dinitrol is supposed to be better stuff and the answer to residual moisture could be a small amount of water soluble rust converter in the mix, may be they do that.
Also, if the surface is sealed then even if any trapped water did cause rust wouldn't it stop when the available water ran out?

Personally, I would go for it.

£450 seems a reasonable price if it's done properly. Have you considered doing it yourself? You could buy a compressor, a gun and a couple of gallons of wax for half that money.

As for the Dinitrol/Waxoyl debate you will get people from both camps saying one is better than the other. I don't think it matters which you use as long as you use something to protect your chassis.

Personally I use Waxoyl and do it inside and out every year and my chassis doesn't seem to be deteriorating now.

Thanks both, useful stuff. Seems a no-brainer really bearing in mind it's stored outside and will runt hrough the winter every day whatever the weather (hopefully!)

I got a compressor and some waxoyl - its actually quite satisfying knowing the old girl is protected!!

I've always used waxoyl on my vehicles and been pleased with the results,I use black on the chassis and clear elswhere.