I have given up on plain foundation. I will only use plastic foudation with the wax coating. The bees build it out faster, it more durable, wont warp in the hot weather, the bees cant chew it up, if their a spot of drone comb, it can be scraped down and the bees will rebuild it as worker cells because the imprint is their, wont blow apart while extracting, and the price is now comparable to regular wax foundation. Plus, you save a ton of time while assembling, as you dont have to wire and crimp it in place! Allen Banks Honey Road Apiaries authorised Mann Lake Dealer