"Steve W." wrote in message
news
Jim Wilkins wrote:
"Gunner Asch" wrote in message
...
On Thu, 6 Apr 2017 13:34:05 +0000 (UTC), unk
wrote:

I would like to be able to tell by colour if a screw has turned -
does
that exist?

Low-strength/removeable...

Maybe a kind of varnish?
Fingernail polish works nicely as both a thread locker that will
allow
the screw to be removed easily without extra effort, and it will
show
if the screw has been removed or moved.

Works better than "locktite" for gun applications. And you can
get it
cheap from the missus or the discount store.

Have a good story ready for why you need it. I've found it in all
the electrical coding colors, some of which would be really weird
on fingernails.
-jsw

Used it a lot when I did electronics repairs. I used a real ugly
green. Made it easy to tell if I had worked on an item before and if
the part had been touched by someone else.

For the OP, I've not seen a single coating that changes that way,
BUT if you put a small dot of the paint at the junction of
screw/part. it would show up if the screw was moved because the
coating would be broken and shifted.
Another option would be a simple index mark, like using a sharp
scribe across the end of the screw and up the interior of the hole.
Misalignment means the screw has moved.

--
Steve W.

https://www.google.com/search?q=tamp...en&gbv=2#spf=1