I don't know about the car wax, but I have heard that Johnsons Floor Wax (the kind that comes in the round tins like car wax, not the liquid type) is great for things like the tables of woodworking tools, such as scrollsaws, table saws etc.. it helps the wood slide over the table easier. I haven't tried it with my sewing table though... but as long as you put it on, and wipe it throughly, so there isn't any waxy build up, I don't know why it wouldn't work.