in my mind, every larper is one of three ages: under 19, 19 to 60 or over 60
I think that’s just true lol
I have never done this myself (not a lot of drywall in europe), but I found this video which seems to describe exactly what you want https://youtu.be/FonedKgrP5U?t=224
hope it helps!
Hm. The source for this is a vtubers YouTube short?