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From my understanding and from what I've been told, when ally is cut and heats up it can clog the normal cutting discs (mild steel) which can cause them the catch on what your cutting and then shatter. I've been told if you rub plenty of surfboard wax on the discs it will help prevent clogging but you have to keep the disc waxed up. I've been told cutting discs for Ally are not for the faint hearted either and it's probably best to use a saw............
Not my opinion but just passing on what I've been told by someone in the know.