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2. Use a lot of smaller balloons
3. Get several gallons of liquid dipping latex, it will be treated with ammonia to make it sticky and coagulate better (It stinks), a large tank in which to make the Balloon, the tank MUST include circulating machinery or the latex will clump up and set in the tank, Get a suitably sized former, for balloons these are generally ovoid or spoon shaped, Varnished wood would do just to make one or two,
Dip the former into a Casein solution, this will act as a coagulant for the latex, dry, Dip into latex to coat the former, repeat coagulant and latex until rubber is thick enough, 3 or 4 mm at least for helium. Dry for several hours in an oven at around 130 deg C to cure the rubber. peel off and test for holes etc, repeat as necessary
Do you really want to do this?
I spent 6 months of my life making party balloons or rather monitoring a machine that did this.
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