Two things that help Rit dye take to canpoies are to add a little salt and some vinegar to the mix. I believe they are called "mordants" and help the dye permiate and take.

I like silicone adhesive for canpoies. I've had poor results with some "white" glues billed as canopy glues, but probably because I am lazy and don't strip back the covering before gluing doen the canopy.