It's very effective at about 30 PSI. You can kind of "pick out" a few needles to go into a really small nook or use them all. It's actually fun to use. On large flat surfaces, like frames, you can use an flat air chisel at low PSI. Scrapes it off fast but can gouge metal if at wrong angle. Takes some practice. A semi-dull chisel is best.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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