PhillB
GT Fan
Yeah, I realise I may not have done mine correctly, well the Zaskars anyway, (I don't think my other bare Alu bikes are/were Ball Burnished). However, I like them... .If they are done properly they don’t dull in my experience.
Certainly the ones I’ve got which are still perfect years later. They aren’t ridden though which helps.
Remember that BB wasn’t polished.
Could be that difference in method is why mine do start to oxidise, which is probably overstating it as it is only very, very minor.