Hey Matt!
Thanks for your quick reply. Unfortunately this was back in the day, when applying Aquasure on seams wasn’t ‘en vogue’ so I’ve only used it at the bottom bits where the seams join the floor. On my next one I’ll be sure to do it on the seams as well.
I’m now thinking about fixing all leaks in my existing rafts as good as possible and then slice them open on ~4 locations with maybe 15cm slits to generously apply seam sealer on all seams after the fact. Afterwards I’d just patch them up again.
Does that sound crazy? I think I’d take the risk of cutting open a good raft to get a more airtight built.