Step 2: Make the Stencil
In this version of the clock, I made the stencil using another fiberglass PCB.
Just etch the board using the same method you used for the controller and display PCB, and lacquer it to protect the front of the display.
In order to reduce light breakthrough to adjacent words, I used 30mm baffels made from spare PCB stock. These were held in place using hot melt glue.