Two things about plastic foundation: 1) I do not consider Duragilt to be true plastic foundation like Pierco and Permadent. If you scrape off the wax coating/combs from Duragilt, you are left with an unusable plastic sheet. With the other two, the cell outlines are part of the molding, so you can scrape off old combs and the foundation ir ready for reuse. Also the true plastic foundations are quite a bit stronger, and hence no "blowouts" during extracting. 2) When I tried Pierco's recommended method for drawing comb (interspaced drawn comb and foundation), the bees simply extended the drawn comb to enormous thicknesses, and did very little on the foundation. The result was a jigsaw puzzle to disassemble, and few usably drawn new frames. Accordingly, I now use all-foundation supers for drawing comb, that way the bees draw comb properly. BTW, Pierco is right on in recommending that foundation drawing only be attempted during a strong nectar flow. W. G. Miller Gaithersburg, MD