The bladder is made of a plastic painter's dropcloth from the hardware store. It works but is not ideal. I am trying to find a source for polyurethane film for the next one. Polyurethane is much more expensive but extremely tough and welds a little nicer. I built the bladder a little oversize to allow room to make repairs if need be and also to ensure that the nylon shell takes all the force leaving the thin plastic in a relaxed state. The shape of the bladder doesn't matter either. The only reason I tapered the front end was to be sure that the bladder was able to reach all the way into the point of the float. Any voids between the nylon shell and the bladder will cause stress and leaks or total bladder failure.
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