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Message: <blockquote data-quote="WolframM" data-source="post: 498800" data-attributes="member: 33167">Stainless wire brush, make sure your patch is at least 3/8" longer than the crack you're patching, and wipe with acetone before welding. Same rules for using "alumi-weld" too, you could braze the patch on with a (admittedly large) propane torch, and it'd work just as good as long as your patch fits the curves and distortions in the panel well.Never use a flap disk or sandpaper, they are most likely aluminum oxide grit and are just going to add to the oxide layer you're removing, and never a carbon steel brush, as it'll embed iron and iron oxides into the aluminum and both will cause trouble, during the weld and after welding.</blockquote>