I have a customer that wants to frame a large (30x60) poster of some value. I have already told him I don't ship anything that large but would like to offer some advise on framing such a large beast. Besides the usual UV or museum and spacers, he wants to hinge mount it with filmoplast P90. I don't think that is advisable for a poster that large so would like to get some advise on this. In the past I have read (here?) about linen backing but no nothing about it. I have heard that there is an alternative universe dedicated to archival poster framing but I can't find out much about it. I won't be doing the framing but I would to steer him in the right direction. Any thoughts?