Some very interesting thoughts and observations here.
I too was taken aback by the amount of corrosion on the steel bits under the Supersport on display at Williams. I've looked under Tarka and found very little, and nothing of consequence. Tarka will be 3 in April net year and have about 33,000 miles on the clock. Perhaps regular use helps preserve the car?
Turning to the aluminium corrosion aspect, the flat bottom of the car looks much the same, no obvious corrosion anywhere. Yes, ACF 50 can do no harm, but is it needed?
On Tarka the joints are as on any Trad, other than where the tub joins the chassis. A trad has wood, aluminium and steel all in potential contact. Tarka has steel bolts, but otherwise the joint is aluminium and wood. Even so I keep ACF 50 run sown the beading, to be sure.
The trad bodies, at least the modern ones, don't seem to suffer from salt corrosion, washing down regularly is important if used when salt is about, but I think they are capable all weather cars. Tarka will be used through the winter and I'll be aiming to make my usual Boxing Day and New Years day runs out, unless there is snow on the road.
