I don't know if this is the correct forum or not for this but here goes and if you can point me in the right direction I would appreciate it.
I have a large 3.5'X2' (approx.) puzzle that I would like to have hung. The issue is that it is not standard shaped puzzle (polar bear), and would like to hang it unframed.
The puzzle has already been sealed with a puzzle matting product. I need a safe method for hanging this and still keep it visually appealing. My first thought was using mirror hanging clips, but did not know if they could offer the support the middle of the puzzle would need to keep from bowing. Again any help would be appreciated.

 

pinman,

Is it possible to cut out some 1/4" underlayment to a close proximity to the edges and apply contact cement to the back of puzzle and this? This would give it a rigid back, no flexing and have a good base for a hanger application.

Then use adhesive type hangers using contact cement again to ensure that it does not give way.

Hope this helps!