Next comes scary bit.. scraping and cleaning off the backside of the glass!!! First I cut a line in original paint with a hot scalpel blade, so as not to chip the surrounding art, where I wanted to paint up to. Then I scraped off all the old paint up to the cut lines, and cleaned the glass with Windex. 1st pic shows the top part cleaned up.. I hadn’t yet cleaned the ‘lightning bolt’ area (light blue) below when this pic was taken.

Next I covered the surrounding areas and gave the glass a few coats of the acrylic blue. (2nd and 3rd pic). I found it necessary to do several coats to get the paint to cover and not be “see through”. As a result, this will NOT get the flat white backing as it was not necessary, and would’ve dulled the lamps too much, (it blocks a fair bit of light already).