PVC is very difficult to bond to other materials. We have found the best compromise to be PU building adhesive (Its available in a mastic tube from the local builders merchant). Be careful not to put too much on as it foams and expands as it cures. The adhesion to the print and to PVC is incredible (its just messy to use if you are not very careful.
In terms of solvent adhesives the best that we have found for this sort of application is “Tensol 12”, This contains dichloromethane / methyl methacrylate and is fantastic for gluing prints together and for bonding prints to PVC just AVOID the fumes!!