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ive had this done all surface rust was ground off cleaned up then primed up to stop it coming back then dinatrol applied also had all crossmembers and doors filled wasn't cheap at 500 quid though jr classics did it near Doncaster

Cavity Wax is popular, Im going with Dinitrol Rustproofing and underseal. My mechanic is doing it, so far he has cleaned all underneath including cavities and rails and all areas inc wheel arches, he is going to rust treat any rusty areas first, then he will go through all the stages of application, basically he said every inch of her including filling the sills up with it as well. Then clear Cavity wax inside the spare wheel well and protect up in behind the quarter panels and lift the carpet and protect the inside floor sections too. Will take a while but thats on the schedule to be done. Wont be cheap but I know he will do a flawless job with it.

Agh right so prob not a viable option then? I need the car on a daily basis, it’s kept in the garage when not in use but I can’t be without her for a long period of time. Theres a place local to me saying 3-5 days but as you’ve said Chris it sounds like a quick job cutting corners sort of thing. Here they are: http://rustproofing.wales

Waxoyl is soft and will soon be blasted off exterior parts - it is better suited to cavities and stopping rot coming through from inside. Be very wary of underseal of any sort. If it's just sprayed on over the top of whatever's there then it will seal in dirt, moisture and existing surface rust and accellerate the rusting process. Preparation is critical and isn't fast as it includes removing all dirt and loose paint (many quick turnround places use a steam cleaner or jet wash) Then needs to be left long enough to dry in all the fiddly bits - this ideally means days / weeks in a warm dry place. Then any surface rust needs treating, then a layer of red oxide then finally the underseal. Shortcutting any of this will probably lead to accellerated rusting, especially in the seams - the most critical part to strength.