Masking to paint a kit canopy can be a pretty complex and time consuming thing. Not to mention possible (probable) paint bleed under the mask to mess-up the clear areas. Eduard has a solution for this in the form of a sheet of die-cut masks for specific aircraft. This set is for the Hasegawa 1/32 scale Bf 109F-4.
You get a small (1-7/8” x 2-5/8”) rectangle of a very thin, tough material on a peel away surface. The die-cuts are almost invisible and I had to hold them at an angle to my light source to actually see the individual pieces. That is precision!