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Thanks all.
i have used my inflatable over 50
times but rarely ever inflated it for just one day.
I generally pump it to the max at 18PSI. I always wash after each use and keep in garage . Based on the advise above I might release pressure to around 15PSI after each use. How I do that is a mystery but I guess I will just release pressure from valve for a few seconds after each wash and check pressure before pumping the day after and tweak the release time from there
+1 for baddog's comments. It was clear that the adhesive glue between the layers on the seam failed in the heat. The board was pumped to 18psi. The fabric was soft but fine and not compromised or deformed. The ambient temperature was 36c + direct sun for 20 minutes.
The board had always been washed and stored in a garage. Not sure what else I could do (other than leave it at home, let out pressure on the beach then pump it up again or leave it on the water with an anchor) as there wasn't any shade on the beach. Now, I won't take a SUP inflatable out on a hot day without shade.
Note that dry air expansion due to the heat on the beach is quite minimal, and should not be an issue.
The humidity (water) in the air, however, expands a lot more than dry air when heated. So leaving an inflatable on the beach may be much more stressfull in humid climates than in dry ones.
But the glue softening with the heat is the major issue I guess. And failure will be quite random due to the inconsistencies of manual labor.
One more pic of an inflatable SUP in action:
Gong "Couine Marie" (a pun: meaning the Squealing Mary in French / Queen Mary) 7'5" Simmons shape
