You’ve set it under water when inflated?
No not yet, when I inflated the tube I tried to listen for a hiss. When I tried inflating it more it ballooned. Probably a good idea to go back to the underwater technique
Latex tubes do that, be careful inflating without a tire. I had the same problem, turned out the valve extender needed extra tightening.
@miloas started
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You’ve set it under water when inflated?