In reply to:
glass-poster-cardboard or whatever's on the back.
This is the way I do it and it's much cheaper than having it dry mounted. But dry mounting looks better. No wrinkles. I've been battling within myself for years as to which way to do this. The only reason I've never dry mounted is 1.) because it decreases the value, and 2.) it's more expensive. But damn, it looks better.
Love And Anger ~ KB