Just a thought, since in my biz I tend to deal with all kinds of products . . . for masking in this case.
3M makes a masking tape which is blue, has an orange core, and is usually sold as ultra low tack or "designer" tape. Now the intent is you can put this on a painted wall after 24 hours (like for multiple color rooms) and it won't peel the paint. But its thin, very smooth, doesn't leave a residue, and cuts clean. I have to think it would be a perfect fit for masking canopies. An inch roll which gives you what, 150 feet, is about 4 bucks.
Don't confuse with the other blue textured tape. That stuff isnt worth squat on anything.