For extra large posters you need to apply more. I have a 48' poster and I used 10 strips, 4 down each side and one in the middle of each top and bottom. They last for about 2 years before weather changes and being over a floor vent weakens them. So I just bought a new pack to reinforce the old ones, plus I'm moving the posters around so they're all getting replaced.
Rating: [5 of 5 Stars!]