The Tyvek tape tie outs are too brittle. I had five of them snap at various points during the night. I easily repaired them with a bit of clear duct tape. Tyvek tape works okay for the hems. There are no seams on this tarp. The Gorilla tape I used on the first version works much better for tie outs, but JS and I thought that the Tyvek would work well and be much lighter. Clear duct tape works better, and Gorilla tape works best. With all of these tapes, you can peel them off pretty easily without damaging the polycryo and move them or reattach. Repairs are easily made, and the tarp only took a few hours to make. Cost was about $7. It was great to be able to watch the stars with! I'm waiting for the August meteor showers!