Yes. Cover thickness, coating, grain direction, and surface finish can affect how the document sits in the strip and how evenly the spine closes. The complete stack should remain square, with every sheet and cover reaching the adhesive area before the binding cycle begins. Very stiff, curled, coated, or uneven materials may require a different cover setup or a strip designed for harder-to-bind stocks. Do not increase heat or repeat cycles without consulting the machine instructions, because excessive heating can damage covers or weaken the finished appearance. Produce one complete sample with the actual paper and covers, allow it to cool fully, and then inspect sheet security, spine alignment, and opening movement before committing the rest of the job.