I think there's a few issues here. First, bees frequently resist pulling wax on plastic. Adding a layer or more of beeswax seems to help them accept it better. When I used plastic I often had colonies with mixed wood/wax and plastic and the wax foundation always got drawn first. If they REALLY, REALLY need the space they'll just use whatever they have as it seems the urgency to create cells overrides their choosing preferred foundation.
That said, I often see posts here about spraying wax covered, plastic frames with syrup to "help" the bees create comb. I personally don't think that helps. I think it might fool the beekeeper into thinking that the bees are suddenly more accepting of plastic but I think what's going on is that the bees are interested in the syrup....not the plastic.
Finally, the post title is "Enticing Bees To Draw Comb And Store Nectar In Super". Bees will draw comb when they perceive a need for space. If they don't have space overhead, they obviously won't be drawing comb in a super. If you put a box of frames up to, especially with an excluder" the rule still applies. No need for space means they won't draw comb. If they're packing in nectar elsewhere in the colony INSTEAD of in the super, try putting a frame of brood up top above the excluder. That gets the bees working through the excluder and they when the brood is finished you can swap the frame out with a "clean" one or just leave it if you don't mind brood comb being re-used as honey comb. Once the bees get used to the super AND they have a need for space, they'll pull wax and fill it up and you'll be all set.