Here's a very useful product to help modellers avoid the grief involved with masking a canopy. These are pre-cut masks that fit very well. Caution should be used not to leave these masks on the canopy plastic for more than 4 to 7 days or so, if the canopy has been coated in Future. The adhesive in the mask is said to react to the Future on the canopy, but this is only if the masks are left on the canopy for extend periods of time. In regular use there will be no problems if the canopy is coated in Future and the masks are removed after the paint has dried.