So I thought, maybe I can mix something up?
Step 1: What to use?
Next, I tried spraying some watered-down PVA glue. I used a High Volume Low Pressure (HLVP) sprayer (pic 2) to get a fine spray but you could probably get away with any type of sprayer. When it was wet, it looked like it was going to work, especially a heavy even coat. Unfortunately, when it dried, it was only a bit better (pic 3) than the brush-on PVA glass.
I figured out that the reason it wasn't obscuring is because the PVA dries glossy and not matte. I looked online and found that artists use something called Matte Medium (pic 4) to reduce the glossiness of paint, and after a trip to the art supply shop, I mixed up 1/3 MM to 2/3 water and sprayed glass number 3 (pic 5). This seemed to work perfectly so I mixed up more and started on the doors.