Good question, I am also getting the same results as you, I'm not sure what the tempature of the workshop is, usually somewhat cold lately but the work piece does seem to heat up quite a bit. Same thing with the black blotches too with too little compound. I'm really new to this myself so I know I do have a bit to learn but it does seem pretty universal with the problems with polishing aluminum. I have quite a few components to polish and don't want to screw them all up.
B.Kidd
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