I have it but have only used it once. Mine was milky, and runny, like a watered down Elmers white glue.
The instructions say to use the smooth rounded handle end (opposite the bristles) of a paint brush to make windows, I used it to make periscope covers on my Sherman, it took several tries to get the "bubble" to cover the entire area of the window and dry to actually cover the space.
I squirted some in a small receptacle so I could get a visible drop on the paint brush and just moved it around until it looked like the window was covered. It did not work great, but it worked better than anything else I could think of, and the final product I got is good.
Hope this helps'
Bill