I'm in the process of removing 5 hot water radiators from my 1917 home to have them sandblasted. I'm hoping to get some advice from the forum in two areas...

#1 -- Though I've completely loosened the large nuts on the supply and return sides of the radiator (see pictures below), the radiator won't budge.

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There isn't enough clearance on either side to slide the radiator out of the way. The valve stems seem to extend, and are nested, within the valve itself. Do I need to turn the other larger nut (closer to the radiator fins) to back the valve stem away from the valve? Any advice is appreciated.

#2 -- I've found a shop that will sandblast my radiators, but is there anything I need to be careful/watchful of, in getting this done?