First thing i had to do was to carefully cut and scrape out the old yellow paint, but not before taking pics of the text that i could use to recreate the text later as reverse printed decals, same as i did on my Dracula BG. Again i used a scalpel blade heated in a flame to cut along where it met with the mirrored border, then with a small scraper blade i removed the old paint. I find that it helps if i have a fairly strong light shining up under the glass as im cutting, it actually can be seen through the silver mask, so i can see where i'm cutting.
Notice too that i put black marks on the lift channel and back of the glass itsself so i could later line up the text mask decals in their correct positions.

After i had the yellow scraped out and had cleaned the glass with windex and some paper towels, i sprayed some Triple Thick on to seal off the area to be painted, to eliminate the possibility of spraypaint bleeding under the surrounding original paint.

After the TT had dried i sprayed on a few light, even coats of yellow acrylic, followed with some flat white acrylic primer after the yellow had dried, to brighten the yellow a bit and to even out the glow from the lamps when backlit. As i usually do, i placed a desk lamp underneath the glass shining up through the glass as i sprayed, to give me an idea of how evenly the paint was going on.