I haven't really done anything with mine. I keep them in their boxes at the moment, and just deal with the curling if I want to use that side of the map. A metal mini will hold the corners down, so if I've got a unit actually standing on the part that wants to curl, the mini flattens it out. If I don't have a mini standing there, then it really doesn't matter much if the corners curl up. The curl is minor enough that it isn't like the whole map tries to roll its self back up like a poster would.