I installed roofing material painted a sandstone color. I don't care to have to do touch up painting as it would end up something less than pretty good.
From one of reviews of the Malco blade:
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The saw blade seems to run cool and doesn't appear to throw sparks like an abrasive blade does. Sparks are really bad on products such as painted metal roofing. The sparks burn into the paint causing rust streaking and early failure of the metal finish.
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