I've been using Elmer's Craft Glue Spray and cement mix. Just get a bag of the cheapest cement you can find at Home Depot, Lowe's, or any hardware store. First try it on a small area on the piece you're working on, maybe the back. Spray a little of the glue on, then using a chip brush dust the area with some of the cement. It takes a little practice, and it works best to concentrate on a smaller area at a time. You can build layers up if you want to.
I have yet to get any of the pieces I've done wet! So I'm not sure whether or not the glued-on cement would turn slushy/muddy/cement-y if it got wet. So keep an eye on that. I would say just be careful not to get the piece wet at first, until everything has dried.
Another option that I've heard of is painting the prop first with watered down acrylic / acrylic latex paint, then dusting some Quikrete Vinyl Concrete Patcher on it when it is still wet. The Quikrete costs a bit more than a bag of regular old cement, but it is not too bad for a 6 lb. bucket. This method would not work as well on furniture such as sofas or stuffed chairs of course, but it would probably work well on tables, desks and such.
Either method is fun to experiment with, anyway!