Unibond 800 is terrific for bent laminations. It's strong, rigid, dries reasonably quickly and, with colorants, the glue line is all but invisible. But it does carry some significant health risks I would just as soon avoid. I'm planning a Maple bent lamination with some pretty good curves in it. There was a brief note in 2013 in Fine Woodworking about using Old Brown Glue as an alternative. I'm wondering what your experiences have been with it in terms of spring back and appearance of the glue line. Also, since it cures by evaporation, how long would you leave it in the press? I expect to use between 9 lamination layers for this project. Thanks