I didn't use a polarizing filter on the lens, just the lights. Shutter speeds were pretty slow already. Maybe I'll have to reconsider. Cloning and healing are, as you suggest, Very tedious. It's hard to find clean areas to sample as well. I have tried selecting one area at a time and then sampling and replacing the color of the highlight points, increasing the tolerance as required to get the job done, but this is not a perfect result. I shot the paintings from 20 feet. Can't get much further. arghhh