if your painting canopies, forget the tape. too easy for paint to bleed through. What I like to do is take dental floss and clear nail polish. Put the floss over the canopy then "weld" it to the canopy with the nailpolish, don't worry, the floss protects the plastic. Do you painting, then drop the canopy in a glass of Cherry Mountain Dew. Let sit overnight and floss and polish are dissolved, but paint remains perfect. I have won so many contests with this technique