Post #758973 by tikiskip on Thu, Feb 11, 2016 7:41 AM

"I wonder if a layer of spar varnish or something like that would work on glass to block UV light?"

This is what the amber Shellac looks like on a light.

And I look for what I call true color glass or plastic to tie my floats with.
That is to say not painted or what I call flash colored, that is a thin coat
of factory paint or even glass sometimes as it will scratch right off in time.

Anything you put on glass or plastic will come off in time, and if the light is outside
it will just come off faster.