I can't find it!
The mat was purchased in 2009. And I've spent 150+ nights on it at a conservative count. This will be the first time I've had to patch it.
It stays hard when pumped and not in use, but goes down over night and is 'just' uncomfortable after 6 hours (less if it's cold)
I've crawled all over it in the bath, I've soapy watered it and watched for bubbles. Having patched literally 100's of bicycle tubes it's not like I'm new to finding holes.... Any idea's?
I don't want to keep waking up to blow it up in the middle of the night or worse have it fail and not be able to find the hole mid trip.