I was never so happy to get rid of the Leer fiberglass tonneau cover I had....No seal what so ever sent it back to them once. With it closed I bet I could've took a leak in bed of the truck. Leer even had the gonades to threaten to charge me if I sent it back and it wasn't their fault. They didn't charge me but they didn't solve the problem either.
As a reminder it rubbed the paint to the metal in several places on the bed of my truck. Leer..humbug.