they make these little plastic bags specifically for the outlets/fixture boxes. basically you put the box in the bag then attach it to the wall.
Next slice a small hole in the bag and put the wires through the hole reattaching everything in the box.
Tape the hole shut as best you can.
cover the entire wall with poly and cut a small hole out by the bag making sure it overlaps 1/2" or so.
tape the edges of the bag to the poly and you're air tight.
It's a pain in the *** to do this after the fact because you have to remove and reinstall the box to do it right. You could just let the box swing free and skip the dewiring with a big cut requiring a bit more tape that never seems to get it completely sealed.
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