Feeling (only somewhat) guilty for causing some thread drift — that got little traction anyway (NPI, but noted

) — I’ll get back to what I think was the OP’s original intent.
I am now committed — and likely will be committed before this saga ends — to sealing the Stornello’s wheels and, if successful, will also do the III’s.
I have read enough of the various threads on this here and elsewhere to make my eyeballs melt and dribble down my cheeks! Opinions, navels, etc., but all good stuff … and I appreciate the trouble folks went to reporting their experiences. This thread,
https://wildguzzi.com/forum/index.php?topic=102083.0, was especially helpful, but many others out there.
So, here are my additional questions/concerns, as I did not see — but, of course, may have missed because of the seemingly endless volume of material — any mention of these two products:
https://tinyurl.com/3M-4000-UV-05280https://tinyurl.com/Wheel-Sealing-TapeAfter looking at 3M’s application matrix, it seemed to me that, despite all the mention of 5200 and 4200, the 4000 was the best for sealing to metal. It’s flexible and waterproof, too.
All tape seems to be insurance in the apparently rare (but it happens) cases of a nipple leaking. I think I want one-inch width, and this seems fine, tho the “permanent” part made me wonder.
3M 4011 is double-sided; I could not find 3M 4012 on the web. In the interest of full disclosure, I will confess to using bourbon as a search tool, so it is not impossible that I missed it! 
[Edited to add that I just found this:
https://tinyurl.com/3M-ES-Tape-4411N on Amazon. I'll see how the stuff I ordered --
https://tinyurl.com/Wheel-Sealing-Tape -- looks, then may use it or order the 3M.]
I look forward to (most of) your comments.

Thanks.
Bill