Gatorfoam is very rigid and lightweight. If making multiple layers (say 5-10 sheets per layer), paper or glassine corners and supports (folded paper/glassine) secured around the perimeter would help keep the paper stationary. Creating an "envelope" (again, glassine or paper) to hold the prints would help keep the prints aligned as well. That would also allow for space around the paper and prevent potential damage to the edges. A Pressure should also be used just to be thorough. If simply sandwiching all the prints using pressure in an interior box, volara may be good for pressure is applied evenly against the prints. http://apps.bnt.com/ecom/catalog/pro...roductID=17583