Thanks for all the compliments guys ... yes, I'm VERY happy with her (hmmm why do I always call my guitars "her" ... probably because I love fondling them so much!![]()
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Slug Tape ... I don't know about the stuff you've been looking at, but the tape I used came straight from Bunnings (sorry DB!) ... it is "On Guard" brand and gives no mention of country of manufacture ... as far as I can see from inspection its identical to adhesive copper tape that I've previously brought (and which was sold) as specifically for electrical shielding.
I confirmed that it is electrically connected when touching but then I was pretty careful during installation to ensure that electrical continuity was maintained. There's no "coating" on the outside of the copper and the backside only has the adhesive (covered with a protecting strip of plastic that's removed before you stick it down. I found no other coating on the copper other than the adhesive (and it makes sense that its conductive too) a small piece left out in the weather quickly dulled (from shiny) and started to go that dark-brown colour that copper does ... left long enough outside I'm sure it would develop verdigris.
When we plugged it in and demo-ed it against both an American-build and Mex-build teles, it was the "quietest" of the three by far (even quieter than humbuckers without shielding)... so I can only conclude that it is as effective as any purpose-sold shielding tape
P.S. the Garden-department people of Bunnings didn't even know that they had it in stock! (even though being given an initial "Nah, don't think we stock that stuff", I had a good scrounge for myself and found it in the obvious place - the pesticides section of the gardening supplies)