I couldn't decide if this should go in scenic or projection, so feel free to move if necessary.
Last night, we began loading in our next show, which is very projection-heavy. All of the projection screens are Rosco Twin White stretched onto wooden frames, affixed via staple gun. Two of the screens are 2-3 pieces of twin white seamed together via Pro Gaff RP tape. We assembled the screens off-site a few days ago and rolled them onto carpet tubes. Upon unrolling them, we found that the tape lines were severely puckered all along the width. By stretching a bit extra on the tape lines, I was able to reduce the puckering at the ends of the tape, but not in the center of the screen. The largest screen is, if I recall correctly, around 20' wide by 11' tall, with 3 pieces of twin white, running horizontally. THis is the one causing the most trouble.
Any suggestions on how to reduce the puckering? I had thought about trying a heat gun, but that is just instinct, I have no idea if it would actually do anything, or if it might just make matters worse.
Thanks, as always!