I also get lots of glare when I photograph certain paintings. (Of course, you should never use a flash with oil paintings. That will fill the center of your image with glare for sure!)
One other trick I've tried is to place the painting in an area with only dull indirect light, even a little on the dim side will do. You might try a hall away from windows, for example.
Set up the camera on a tripod because you'll need a long exposure. Use the self timer setting on your camera so that you avoid camera shake from actually pressing the shutter button at the time the lens is opened.
This usually works fine for me. There is sometimes a trade off with graininess because of the dim light but it usually eliminates glare in the final photograph.
Hope this helps!
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