I'm not saying shellac is necessary, coton can age nicely... But what that old racer said can't be a valid point against it I think...
I experienced shellac for the first time recently, it's a pain to do (you need 6-7 coats!) but the result is quite satisfying... Raw coton isn't great when it rains in the winter (I have non shellac cotton tape on my everyday commuter / beater)
http://www.universalcyclecentre.co.uk/retroshop.html
Thnaks, I shall ponder this some more!