I had an air mattress that had gone down every night it had been used.
We tried spraying water on it, even then listening for the hole. We had it in our spa trying to see a leak but couldn't.
Then we tried this and of course found the hole.
Only one and really tiny but we found it.
Mark's Reviews & Tutorials
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Plush Mattress:
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Mattress with built in Pump:
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Tear Aid Vinyl Patch kit:
Gorilla Patch Tape, works under water: