When I have a mix of drawn comb and undrawn foundation I usually mix the two together in the same super. I use one foundation, one drawn comb, one foundation, one drawn comb, etc. etc. The drawn comb seems to guide the bees in drawing out the undrawn foundation more evenly when you intermix them. I've put on as many as three supers at a time when intermixed like this with no problems.
I would not put on more than one complete super of undrawn foundation at a time.
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