Hmm… here are some of my thoughts.
- If you laminate it such that it’s still thin and flexible, you can easily secure it to the ceiling using a variety of methods, I might consider using adhesive backed velcro, taping the fuzzy side to the poster back and staple gunning the hook side (I’d keep the paper on so that it doesn’t adhere to the ceiling, less chance of ripping paint off once you’re doe). I’d use velcro so that I could reposition the poster, or easily change posters around, plus I always have a lot on hand. You could also use some type of strong tape to adhere the laminated poster but I think the paint might be pulled off and it could fall, plus there’s tape goo to deal with at the end.
- If you want to laminate it such that it’s glued to wood, it’ll become a bit harder to hang due to the weight. Maybe it would be best to screw it directly into studs in the ceiling… might disrupt or damage the front of the poster though. I was thinking you could use screw-in hooks on the ceiling and these v-hooks in the back of the laminated wood and hang it off, but I’m not sure if this would be enough weight holding, especially if it’s just into the ceiling drywall and not any studs. Heck I’m not even sure if there ARE accessible studs in a ceiling.