How to Flatten a Rolled Print. Posters and art prints are one way to decorate your space. Tape or tack the prints to a wall, or frame them for a more elegant appearance. I was just hoping to get a little feedback on the methods you guys use to flatten your prints after they have been rolled, DOs/ DON'Ts etc. A customer has a print - 25x35, open edition on fairly heavy paper -looks like a coated paper. The print has been framed and has become very wavy, cockled. How to flatten rolled up posters for framing? If this is your first visit, be sure to check out the FAQ by clicking the link above. Once in a frame with glass, prints will tend to flatten, rather than curl. The culprit to destroying or discoloring your prints over time are acid, daylight, and air. What is the best way to flatten prints created from roll paper?. You have the same problem with old print paper, it will roll up also. I have found some 70 year old black and white prints, apparently on RC paper. but if you can relax the print enough, you may be able to flatten it a bit. Most prints and posters are rolled to ship, but you'll want to flatten them when you get them. If you just roll the print in the opposite direction it will flatten.