Review (2/5): Doesn't adhere well to clear parts, Works well if you don't expect too much
The most obvious use for this mask I could think of was masking clear windows on airplane canopies, but the mask doesn't really like to stick to the clear parts that well. I expected it to be much more aggressive so that I could cut intricate details, but fine lines of this mask just lift off (Think the thin braces between panes on an X-1 or a B-52. I ended up painting those by hand). I did manage to make this work on more simple shapes, but it is still pretty fragile.
You could probably mix up your own solution with sugar and food coloring that would be stickier.