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The salt over there is a bit different. Its much more concentrated than, say, salt water. It will eat through anything I would say.

Ive seen a few vehicles imported from the UK and US where they...

That tectyl stuff was rubbish Micky. Used to dry out and crack and let the water in.

Yep. something that will stick, is water proof and flexible.

Not really sure wax stuff will withstand...

Well, in the old days we used to use fishoilene. Stunk like hell, but bloody worked well.

There's a great product made by Wurth. 'Cavity wax'. Apparently it is used in aircraft and its good.
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