I had my Whalen framed with non-glare. The painting already has a hazy texture to it, and it adds a bit of the "Vaseline Lens" look. But it doesn't have any reflections bouncing off of it.
Call up a glass shop and ask for a piece of non-glare glass in the frame's dimensions. OR, there is an Aaron Brother's in the East Mowry shopping complex (the nearest one before 880). Call first, they are notoriously slow. (Michael's is also another possibility, and closer. (Same company).