The pre-Superform wings are prone to corrosion caused by the small diameter mild steel bar used to reinforce the wing edge that reacts with the aluminium. In essence the wing became the anode and I doubt that there was much to be done to prevent electrolytic reaction other than to change the method of construction.
Replacing with new factory wings will remove the corrosion issue at the expense of originality as the wing shape is different. You could have the steel reinforcement replaced with aluminium but it will be costly to have your wings repaired. I believe that it may be possible to get new wings from the original manufacturer based in Lancashire and you could see if they could repair. Alternatively, you could fit fibreglass wings from Sid Watson who bought the moulds from Rutherford Engineering; right shape, more durable and say good bye to any corrosion issues.
Last edited by Cheshire_David; 21/02/16 06:35 AM.