I have had at least 7-8 valves come unglued, and I think big G is onto something, My kites stay in the car on the sun for days at the time.
But I found that aquaseal does wonders, stick a q-tip through the valve to keep it from sticking to the back side of the bladder and with another q-tip apply glue under the valve where it came off, then after it dries, apply aquaseal all around on the outside of the valve.
All the valves I fixed like this are still holding, even with kites still baking in the car........
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