LOL, I knew you weren’t “trying to sell” anything… I was just mentioning my experience… but that’s not to say I don’t have duct tape in my grow room… it is ALL around my windows, holding pool noodle pieces to the door jams to keep the light out and I even fold it in thirds to make ties for plants that need support.
I brought one in to take a picture and the cat thought I was inviting her to play:
I suppose strips of old pillow cases would work but I gave them all away in a fit of “cleaning house” last year. 