The cradling keeps them from warping; smaller panels don't need it but the larger ones need some stability. I also like the look of the cradling and it helps protect the edges of the panel from chipping. I also paint all the way around the sides, as if it were a gallery wrap. All in all, I love this surface.
Jean
ps, I forgot to add that Guerilla Glue is just fine (I knew you were right all along, Kim!)
