Re: Substance applied to Radio circuit board screws ?
What I recall was like cellulose paint on screws and, in particular, trimmers, to stop them moving with vibration. It was thin enough to allow movement if necessary, it just cracked.
My memory is of a green paint used by Grundig.
I've used nail varnish to do the same job after realignment - I also used it for creating the resist for one-off printed circuits.
As for the sticky stuff used for picking up small screws, etc. mentioned in post#8 - essential for retrieving dropped brass nuts and washer from awkward places - I used to use the sticky stuff that came with the sets - the wax in the end of waxed paper capacitors!
When plasticised caps put in an appearance I adopted the practice of throwing all the waxies I changed into a box that sat on the side of my desk.
When I changed my job and only saw 'modern' stuff (well it was in 1970!) I regretted not taking that box with me!
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