Paul "Raymond": ... Unfortunately, the pvc that I have glued, has a layer of
relatively thin pvc over a thick core. The glue joints have held, while the
laminates have peeled off of the core material. So I'll use this glue, and
continue looking for a better pvc.
Ralph Hoehn: Commercial builders sew the material first and then cover the
seam with a "rub strip", that only needs to be glued since it does not have
to absorb the tension in the seam.
The rub strip protects the seam by adding (sacrificial) abrasion resistance
as well ensuring a watertight joint.
I have yet to experience a hot welded seam coming adrift, but Pouch, for
example, does not rely on welding in structural seams, which they sew for
their entire length before welding on the rub strips.
The new welding technology by Feathercraft (RF welding of a polyurethane
coating, which is apparently very well bonded to its substrate fabric) does
away with any sewing ... but is probably somewhat less than ideally suitable
for home builders :-). Unless the material can be obtained for amateur
projects and responds just as well to "crude" soldering iron welding ...
Ralph
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