Hypafix is an hypoallergenic medical tape which I have found to be great for sealing henna designs on the body. The tape is breathable and flexible and enables you to tape up a design once it has dried, so your customer can leave the henna on all day, or overnight, protecting clothing and sheets from staining, and of course keeping every last dot in place. If Hypafix were around thousands of years ago, I'm sure the ancients would have used it. It's expensive, but a small price to pay for ensuring a great stain with no "henna crumbs". 10 yards length by 2 inches width.