Spraying on the silver/grey masking paint to block out the light. Once again it just automotive acrylic spraypaint. To mask off the areas I don’t want painted I make paper stencils by placing A4 printer paper onto the back of the glass with a strong light shining up from the front so I can see where to trace. Then I cut out the unwanted areas with a scalpel and place it onto the glass, and hold it in place with a few weights (sockets nuts or scraps of metal etc, im using electric screwdriver bits..lol). I then cover the rest of the glass with paper or cloth to protect the rest of the glass from overspray.. you should see the glass as I do this… a backglass covered with sheets and paper with just a small section exposed.. it looks like im doing surgery. 

Then I spray the paint on.. 2 or 3 light to medium coats, then I usually pull the stencil off straight after the last coat. Doing this type of thing, I HAVE had the paper pull up surrounding paint because of spraying on too much paint, and leaving it on too long.. not good! Hence why I remove the paper stencil quickly.

Anyway here are a few pics showing the process I used. It aint that pretty from the back I’ll admit, but the silver also helps hide most of the touchups from a casual glance at the back of the glass. but not too many people will ever see the back once its in the game hey??