Need canopy frame painting help

Two things that I have read about but havent tried are as follows.

Mask with Parafilm M
and paint the interior color underneath and then paint the outside color on top.

To remove the residue try a product called Goo Gone. After airbrushing the canopy and after all painting is complete, including final clear caots remove the Bare metal foil. Moisten a Q-tip with a small amount of Goo Gone and gently wipe off the residue. Goo Gone will not remove the underlying paint or Future treated canopy glass, in fact it will deepen the shine. No more residue, just a crisp clear canopy! happy modeling!

PS; You can find Goo Gone "Citris" at your local home stores or supermarkets in the cleaning supplies isles.
Bare Metal Foil and Goo Gone was used for my 1/72nd scale Italeri F/A-18A in the photo.