Yes Geoff, I have also not had much luck on a longer-term basis with different forms of coatings that have been hyped by the Classic Car press. A few years ago I carefully shot-blasted the steel wheel arches and spare wheel/battery carrier of my then 412 and coated them with a light rub-over of Jenolite. When dry, I then poured or sprayed Fluid Film into the other side of the joints (it gushed through the welds), followed by the application of a coat of the thin Dinitrol and then finished with the thick black Dinitrol.
The black Dinitrol does benefit from an annual lick of the thin stuff to keep it flexible. I only owned the car for another five or six years, but in that time all the former rusty areas did not show any further signs of rust reappearing.
George
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