What kind of glue can I use to attach a laminated poster to a wood frame?
If this poster has potential value either sentimental or monetary I would reccomend framing it like you would a photograph. Based on the size I would use lexan /plexiglass to cover it. The problem with using glue is the wood will expand and contract with humidity changes, the poster will stay the same size. This will result in buckles when the wood shrinks or the adhesive will pull away as the wood expands.