I'm renovating a Hypalon 13ft inflatable - a Mezeler Juca (I've made a few posts recently so thanks for your patience!). The seams are generally in good shape but there are 2 areas of seam which have been repaired previously and leak quite badly. The old glue is a dark reddish brown and quite hard.
One is at the join between 3 seams as in the pics below. I've tried prising the seams apart, cleaning and re-gluing, but no dice - it still leaks.
Is this likely to be down to the internal seam tape?
Would it be worth using a patch?
I didn't peel the seams back completely before re-gluing - is this what I need to do? (I realise it looks a bit of a mess - it's because I clamped it and the glue spread)
The other area is just a single seam leaking. The previous repair included a small piece of cocktail stick, used to fill a gap where the seam has separated - there seems to be more material separated than is needed to span the gap. I've tried cleaning and glueing in a piece of wetsuit neoprene to replace the cocktail stick, then patching. It still leaks. I suspect if I keep trying it'll work eventually, but that's perhaps not the best approach.
Again, any tips on how to make a good repair?
Could I cut the separated seam 90 deg to the seam direction to create 2 overlaps which I can then glue firmly down?
I don't have any pics as it has a patch over it so there's not much to see.