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Susan,
I'd wipe the glaze off with an old cotton T-shirt and odorless mineral spirits. If you're careful, the underpainting will stay put. If it doesn't, repaint it. I wouldn't use that medium again, either.
It sounds like you're using too much medium, as many people do who do a lot of glazing. Too much medium and too little pigment will create problematic, weak paint films. From a standpoint of permanence, glazing is best used as an embellishment, a final refining touch, rather than a technique in itself. A lot more can be done with opaque paint than with glazes. The two can be used together to good effect, if one knows how.
Virgil Elliott
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