imsoweetadid
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Make a thick slurry of the flux, paint it on the opposite side of the weld out to 1/2" from weld area to protect the adjacent metal. Instructions on can call for alcohol but water works well too, about 1 drop to the spoonfull works for a start. After welding the flux will fuse together and leave a glassy surface that will come off with a stainless brush on a 4" grinder. When making water tight welds check to make sure there are no flux pockets in the weld to break out and cause a leak, drill out the pocket and make a pass over the hole.
Im a welder by trade, and I never heard of mixing the flux with water. In fact, water will cause welding defects such as porosity, and cause leaks. If your using solar flux type B for welding stainless, go out and buy a product called HEET. They sell it in the automotive section in wal-mart. HEET is what your supposed to mix the flux with.