You also would ant to avout mixing too much up in one shot. When mixed properly, it'll "kick" within about 3 minuits, and unless you work fast, you end up with a half solidified glob of filler that's no good. I usually won't mix up more than about 1-2 tablespoons at a time. If I need more, I'll let what i put on set, then add as necessary.
Another tip is to keep from getting air in it as you mix. Getting air in it causes bubbles and voids in the filler that you will have to fix later.
One more thing. Not to put down Bondo, as it is a good product, but I personally prefer to spend a couple of bucks more and get the Dynatron (same company, better product)fillers. They're a professional grade filler, and sand out smoother and easier. They're usually a gold color instead of the normal pink, though Dyna-lite is the standard pink color. Auto-Zone and Advance Auto both have been carrying Dynatron, 'Zone seems to have a better selection, or at least in my area.
