Here's some tips I believe I received from Paul Boyer of FSM. Bare Metal foil does a nice job for masking if you...
1. Do a clear coat of Future floor polish on the canopy and let dry for a good 24 hours.
2. Apply the foil and burnish it with something like a cotton swab or rounded piece of wood. You want to make sure you get into all the corners.
3. Scribe around the canopy frames with a no. 11 hobby knife. You want a good clean line so make sure you don't wander away from the lines.
4. Don't leave the foil on too long! I made that mistake once and paid the price. If you get the foil off within the first day or so you'll have no problems. If you leave it on for a month it becomes one with the canopy. Don't go there!
I've never heard of the color or associated adhesive being an issue. That's about all I can tell you. Perhaps somebody else has a thought.
Dave