The vinyl pick up material is 78 inches wide and I think I would consider that before using seams. Its flat with no grain texture. BTW: Haartz does offer a wide material, vinyl on one side and acrylic cloth on the other side. Check with Santa Barbara Upholstery supplies. Seams scare me, possible source for leaking. Also i used polyurethane 3M4200 used in the Marine industry. Semi pliable. This may not look pretty, but was in my budget and water tight.