They make them in clear so that you can paint them in two or three layers as I posted.
The other options are colored plastic, which means you have to choose a paint for the canopy area that you think looks like a clear canopy when finished, or cutting off the canopy and making clear replacements. Clear plastic is actually the easiest way to provide the simplest option.
By the way, I have tried Silver paint, Metallic Blue paint, and the Gold metal decals,,,,,,unless you hit on just the perfect color that no one else has tried, you probably won't like the "paint that area shiny" method when you go back and look at your model two weeks after you finish it.
If you ever do a 1/350, you can then use separate clear canopies and get interior photo-etch sets from White Ensign Models and Gold Metal Models. Then you only have to paint the aircraft like a 1/48th kit,,,,,,,,,including reaching down into the cockpit with your brush.
Rex