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Wonder if herringbone can work on a lap joint, or just a butt joint? Lap joints hold air better.

1050D Cordura ballistic nylon Oh, I should have mentioned that I'll need to do these with a machine, since there will be 100's of feet of seams.

Hi Wiz, All, I'd like to get your thoughts on what kind of stitch would be strongest for a simple lap seam. I'm making a large inflatable tube, and would like to get a seam that's at least as strong as the material. Thinking about using 1050D Cordura ballistic nylon. I've seen zigzag stitches used on sails, and dual-needle straight stitches used on huge stage curtains. Which of these would give the best strength for the 1050D Cordura, or is there another stitch that's even better? Thanks!