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[BigRig]

Pressure foot and seam sealing. I am just wondering if this has much to do with how tight a seam is sealed vs just tension alone.. Common snese tells me it does but just wondering.

[Adam12]

It all plays a role, sufficient pressure included. For me the most important things are having a balanced stitch and correct thread/needle combo. Polyester thread will swell a bit when it gets wet and seals the holes. Too large a needle=hole too large=leaks.