I know there are many techniques people use when refinishing their alloy parts . I have experimented with a few. So far I like the look of bead blasted and Alodyne treated parts, as I find it looks natural. Not sure how it holds up in use though. I see vapour blasting seems very popular as well in motorcycle restoration circles. I have also done a few parts in clear powder after bead blasting, but durability with my DIY powder coating has been hit and miss. I guess other options are tumbling the parts in an abrasive vibrator, etc. What would the BMW museum do for things like valve covers, intake manifolds, etc? Is there a new technique that has impressed you as being superior in looks and durability?