Ooooooooooh! That's the stuff, Dave.
OK, here's what they say on CN:-
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I like this stuff because it's tough, thin, and sticks to itself well. You can dial in for the depth of the undercut with the right number of wraps, and the end is virtually invisible. It's easy to cut against a straight edge with a razor blade. It looks sort of metallic on the adhesive side, but it seems to be a polymer, something like Mylar with the fake carbon fiber pattern pressed in and color deposited on one side.
How much depends on the undercut depth, of course. Typically I think it takes about 5 wraps. For a 1.25" barrel I usually have some left over if I cut a 24 inch strip. The last time I did a 2" eyepiece I needed another wrap or two. I just try to have a long enough strip and examine and feel it as I go. Once it looks like it might be starting to get higher than the barrel, I peel back a little and cut there.
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Seems like 5 wraps of a 1.25" barrel and 7 wraps of a 2" barrel.
That suggests narrow (width of undercut) strips which are 0.5m long for 1.25" barrels and 1.12m long for 2" barrels.
I think your thread said that you have sheets. Looks like roll would be better. Sounds like a new roll is about 2m long.
