Go to the hardware store and get some liquid electrical tape. Comes with a little brush built in to the cap to dab it on the holes and should last forever. The Gorilla tape mentioned above is a world better than duct tape and can be torn into strips lengthwise if long, thin strips are needed behind the zipper in places. My little Vivosun tent has cloth strips behind the zippers so not a spot of light anywhere along the zippers.
I used that electrical tape goo to coat the little wires that poke out of the LED light bulbs so I don't get zapped when I invariably bump my arm into them while working on the plants. I hung the bulbs pointing down so it hardened as a blob on the tips. So far no zaps.
View attachment 5156533
