What stitch length did you find to work the best.
I just made a poncho tarp (6'x 9') of 1/2 oz. Cubin from Quest Outfitters. The hood is 3/4 oz silnylon. Instead of sewing the seams, the seams were bonded with using a double sided tape from Quest. The seams were simple lap seams. Felled seams failed before the seams with only one layer of fabic on each side of the tape. On test pieces with a simple overlapped seam, the fabric tore before the tape let go. I was able to make the tape let go after heating with 2500 watt hair drier for about 3 min. So the jury is still out using the tape in temps >100 degrees for extended periods. For the tieouts, 2 layers of the Cubin film was sandwiched between the grosgrain tape.