Although the filler with fiberglass strands does work well, I have something that I like a lot better. It is Evercoat Metal-2-Metal. It applies like typical plastic fillers, but it's reinforced with fine aluminum particles to help produce a stronger repair. It is waterproof (unlike regular fillers), so there's little chance of corrosion under the patched areas, and it sands fairly easily. It is the nearest thing to lead you will find. I have been using it for a long time, and I really like it. There are other brands of high metal content filler, but I stick with Evercoat products when I can.
Metal To Metal Filler Quart With Hardner
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