Stuart,
thanks for this reassuring information.
I know that sacrificial anodes need to be in an ionic solution, normally seawater. I was thinking along the lines that when wet with salty water from road salt the anodes might corrode in preference to the chassis. But of course most of the time they would do nothing and if, as you say, the chassis doesn't corrode anyway they serve no purpose.
Body work corrosion is another matter. Along with many aircraft operators I'm a great believer in using ACF50. It was designed to protect the inside surfaces of aluminium aircraft, for example inside the wing. So spraying it inside the aluminium body of an Aero might help inhibit the corrosion you mention.
As to the Aero Plus 8 the body is essentially a slightly wider and longer Roadster body: we know they don't corrode other than where they are in contact with steel. The Aero has no structural steel so that bodes well. Even so I think oiling the beading between wing and body with ACF50, as per normal on a Trad, can do no harm. But I'll think about getting the inside of the body at the rear and under the wings sprayed as well.
