this is one of my favorite molds! It's not too deep, but gives you a rock wall that's a pretty good size so if you have a lot of area to cover, it's nice to have a bigger mold to use. And you can prop these up so that you only cast a portion of the mold or you can cast the whole thing. I usually spray a water mix (with just 2 drops of dish soap) to make for an easier release on this one. It comes out easy as it is (because the mold is so flexible you can literally just peel it backwards and then push it back out when you're done), but it's not a really deep mold so I worry sometimes that I will break the castings so the water mixture makes it release pretty easily and doesn't affect the casting you're making. I'm working on uploading a picture of one of my short sides to show how this looks after casting (it's not painted yet but at least you can see the finish cast of it).

this mold is pretty cool the way it makes the rocks look and with some good painting and weathering it will be a great scenery detail.

Used Plaster of Paris in mold. Allowed to dry overnight. Mold relatively easy to remove from mold. It is important to clean residue from mold between uses. Used multiple pieces joined with spackle as retaining wall in a combination HO train layout/Aurora car track.