It's probably a generic term. I'm not quite sure myself, I'll take a look at the container when I'm at school again. It's like, this this white stuff, about the consistency of icing you buy in a can. In fact, it looks like it would taste really good... haha. (it doesn't )
You can either mix it with paint, and it takes on the color of the paint, or you can apply it to the canvas and paint over it when it dries. You can put it on pretty thick, too. My friend, Miles (~intrepidego1), used it on one of his paintings, about an inch thick.