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Think it really depends on the rubber compound. Those Clement XPlors lost a lot of air when I first set them up tubeless (they aren't supposed to be used tubeless), added some more stans fluid and after a week or so, they stopped losing air. Quite a few bubbles on the sidewalls where the fluid had been seeping through.
I don't have them at 90PSI by the way. I just wrote that so people knew the limit.
I tend to get a fair amount on other bikes. All running tubes. Cheap tubes maybe?!