Hi Durr... the modeling putty and the Bondo glazing putty are the same stuff except you get a lot more for your money because Bondo isn't listed for our plastic hobby. I've used both and prefer to save my cash to buy more models. And fingernail polish, with a bit of acetone, easily wipes the excess off. Oh, one more difference is the Bondo is a rustic red color. Other then the cost and the color, they are the same.
EDIT- It's easier to find the Bondo. Just look for it at the nearest auto store.