We all paint frameworks of canopies of aircrafts. But there is one little area of the canopy area no one thinks of doing - the inside frameworks. How to do it? Well, it's virtually impossible to mask from the inside; so I found a simple trick I learned years ago.
Mask your canopy as preparing to paint but DO NOT paint it the color to match the exterior. Instead, paint using the same color as your cockpit FIRST - be it zinc chromate green, yellow zinc chromate, blue grey or whatever it is.
Once dry, then paint it the color to match the exterior color of your aircraft subject. Your exterior color will cover the top color of your inside framework. There you have it - a realistic canopy showing both inside and outside colors just like the real aircraft. Pretty neat, huh?