Time to get a bit more elegant than heavy books on prints coming out of the dry mount press. My largest prints are 11x14.

My first thought is a sturdy, very flat steel sheet of adequate weight, perhaps 15x18 or so, which I could spray with Rustoleum or similar paint. I think Zone VI used to sell such an item. I have no idea where to source such steel or any specific kind I should or should not acquire. Or, maybe a piece of 3/4-inch plywood would be heavy enough, well-sanded and similarly painted. I would worry a bit about using a felt cover, since the residual moisture in the hot print might allow little fibers to be pressed in.

What works for you?
Thanks.