Coo,
I just painted mine the other day. Pactra makes a paint for the inside of the lexan rc car bodies. You can't always be sure that spray paint from a hardware store won't attack the canopy. Parma also makes a water based paint for car bodies called Fascolors or something like that.
I shot mine with silver and will trim the glue line with black trim tape. I don't like to glue to paint so I mask off a 1/4" along the inside bottom of the canopy.
My canopy glue is drying now. Now I have to wait on a half way decent day to fly!
basmntdweller