specter,
sorry noone replied to your request 'till now. with respect to most of the 'screen' cloths sold on ebay... don't be fooled. having been in the avsforum as well, i can tell you that it's mostly someone else's version of BOC with an entrepenuering spirit.
having said that, if you've already won the bid, ordered it through this site, and/or bought it a someplace such as joann fabrics... and if you're not entire blown away with it... then hop over to the LF Theory thread.
paladin, has posted directions how to make a mylar mirror perfectly flat. the same can be done using your BOC in place of the mylar. which you can then spray paint with a MMud mix and put a smile on your face.