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I am making some picture frames with compound miter angles, reinforced with biscuits. (This is something that I swore I would never do again, but that’s another story.) Rather that the molding being flat, it rises up at angle. If you’ve never tried it, it’s at least an order of magnitude more difficult than simple mitered corners.

Does anyone have a good technique for getting the corners square and aligned during glue-up? Any clamp I’ve tried (and I have most types) merely distorts the joint, since there are no good flat surfaces that run the width of the molding. Even the usual masking tape trick is of limited use because these have biscuits, that are required for strength.