[sswee]

From experience with glass beading for finish and not plating. Drop your air pressure down to 50 or 60 psi. The lower, the better. Back off with the nozzle and keep it moving. The heat generated from the air flow and particulate will blister plating. I've seen it get hot enough to ripple aluminum. Just hit your hand one time, even with the heavy rubber glove, you'll have a hard time getting your hand out fast enough. Ask me how I know. LOL
SS