Were you using the tape to cover sharp edges on the "hide" after cutting the doorway? If so, all you need to do is slightly melt the plastic. Get a cheap "soldering iron"- which is also what most ppl use to put ventilation holes in the plastic tubs they use for snakes. Like this: "30 watt lightweight soldering iron"
(always do this- melting plastic- OUTSIDE like on porch or in garage- as the fumes are very toxic- avoid breathing them, okay?)
Yes I was. I do have a soldering iron I’ll use that