hey Chris, Ive been using Liquid Latex rubber mold builder for my figures to mask. Ive recently started building aircraft and decided to try it on the canopies. It works great! I got a 16 oz jar at Hobby Lobby for $10.00 I just use a small brush to apply it, and maybe a microbrush to get the straight edges. Just make sure to put down 2 coats with any liquid mask to avoid getting those tiny streaks. alos, dip the canopy in Future first before using the liquid masking. I tried the ambroid mask, and it was too hard to peel off , it was really thin. I guess a toothpick couldve done it, but I didnt want to risk scratching it. The liquid latex just peels right off with your finger.