I haven't liked Rit dye too much because it never gets the canopy as dark as I want it. But I'll try it again one day.

Usually what I do now is airbrush the inside of the canopy using Tamiya acrylics. You don't have to buy a translucent color because you can make it. Tamiya sells a crystal clear. Pour half the clear in a clean bottle and add a little of whatever color you want. Spray a piece of glass or scrap plastic to see if you like the color.

If it's too light you can add more color or you can spray more coats. I like to make the color a little anemic so I can build up to the color I want rather than risk making it darker than I want.

If you don't like how it looks you can remove acrylic with ammonia, polish the inside of the canopy and try again.