I talked a bit with one of the producers about the thickness of the mud. I tried to suggest he use a dryer mix of clay, so things would be stickier, but he said if the clay was too thick, you couldn't sink. My next suggestion (and I personally thought this sounded like a *LOT* of fun!) was to have his normal thin clay pit set-up, but to dump a lot of dry clay on top of it, so he would have a layer of thick, sticky clay atop a layer of thin. The part of this catsuit video that I found so interesting was the fly-paper way she was getting stuck in the surface. Having that atop a clay pit would (I think) allow what looked to be dusty dry ground that would liquefy into a very sticky surface, stopping a model in her tracks, but allowing her to go down without much trouble.

Unfortunately, this wouldn't be something you could "reset" easily.

Things would need to go well on the first take, and there wouldn't even be a handy way to rehearse it. Heck, it would take rather a lot of experimentation to find the right amount of clay to get this to work at all.