Hi Dan,
"The print on the front is good enough as a sealer and with all 6 surfaces now sealed this product is extremely stable and does not warp."
I must say that I found this sentence to be interesting, albeit not what I was referring to as a "Sealer". Taking into consideration your expertise in woodworking etc., I'm sure you are aware of the process of producing Plywood and the fact that the final product is anything but acid or lignin free, as well as other issues that could easily have a rather negative effect on the attached printed image. I think perhaps you didn't really mean that the Print is a sealer, which would seem to mean that it is there to protect the Plywood base. My concern in this case is protecting the Print, not the base. My mention of a "Sealer" was in the sense of protecting the printed image from the negative elements contained in the wood itself. I imagine the high quality Plywood you use might have a lower percentage of such elements, but I very much doubt that they have been eliminated completely, simply because the Plywood was never meant to be used in this way. I suppose longevity is not always a factor in some situations, which I understand and accept. However it's not something I would overlook and I know my customers wouldn't either.
I'm open to more in depth information on the Plywood you use for this purpose Dan, even though I'm sure it is probably better than the OP had in mind originally.
Gary