If i read correctly maybe i didnt, i thought the only thing wrong with the foil was, it was cut a little longer and it was the wrong color , and that was the only reason its being sold as b-stock. Maybe i read wrong, but i ordered another 36sq ft of it myself to good of a deal to let go only for some wrong color foil, and taking a couple extra seconds to trim the foil. idk what ur putting urs in but 1 complete layer in my trunk of my 06 impala was 40sq ft. if that will give u an idea on what u'll use.