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Through a different hobby I came across a possible solution for stray wire strands and exposed earth points...
Paint on electrical tape :p
https://www.ickysticky.com.au/produc...cal-tape-118ml
I haven't used it but thought others may be interested.
I have used their CA glues and found the various grades useful (although I bought mine on special at Aldi).
It doesn't say how you can remove it. Looks fine as a near-permanent insulator for joints that you'll never want to access again, but for guitar wiring, I can foresee problems if you want to replace a pot or a switch etc.
On guitar wiring, there's rarely anything that can't be protected by using the right-sized heat-shrink.
On lock-nuts (a suggested use), you always want to use something that can be easily removed, especially for ground/earth connections.
It's obviously not water soluble, and there's no indication on the site as to how it can be removed. Unlike their other products there's no technical data sheet for it. Looking at similar products (I guess it's rebadged "Blue Magic brush-on electrical tape" from the US), it seems to be a PVA/PVC mix along with plasticisers and solvents, so not sure how you'd get it off if you couldn't cut/scrape it. It may peel off easily, or it may stick like a very sticky thing if the underlying surface is rough or has exposed fibres to cling to. You'd have to use it to find out.
The SDS for that shows it contains a fair amount of acetone as a solvent, so you'd need to be careful you don't get it on any finishes.
https://www.bluemagicusa.com/content...s/BOT55TRI.pdf
More info required I think.
Loads of solvents so use only outside or well ventilated areas.
The only place I'd consider using it myself on a guitar is on any copper tape surrounding a jack socket hole, but even then, you can normally do that quite happily with insulating tape.