We had a few Sim's whilst camping and every single one deflated within a few weeks use, we Al's looked at the Shangri la but could not justify the outlay based on our previous experience, you can pretty much guarantee that the leak will be on a seam and will be almost impossible to fix
I’ve heard of doing this (I think my mechanic used it to find the slow leak on my tyre), but not tried it: spray on water with washing up liquid in it, and look for it frothing.
Inflate the SIM and submerge in water in the bath to try and find the leak?
Then patch it with a suitable repair kit (Therm-a-rest makes one) if at all possible.
If it is near a valve and in a location where a patch cannot be applied, I would mark it first, deflate, then apply silicone sealant in the hope it would stop the leak.
Good luck!
DK
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