After recroming, the exterior of my cylinders look better than new, so I am trying to find out how its done.
I've been told its chemical, but the chemicals I have tried, did indeed dissolve some of the alu, but it became black, not clear aluminium.

Any ideas ?
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom