I've dug out a couple of 05 fuels I had in the garage, the kites are in great nick except for some leaks. Not sure what caused them, pretty sure the kites were ok when I used them last, maybe the glue has gone off? Anyway I'm looking to fix the leaks so they'll be useful again. Most bladders are losing pressure but it appears to only be coming out from around the valves.
Is there a common problem with the old valves and what's the best way to fix these

. I assume you can purchase just the valve part and glue it on? What glue, how do i prepare the surface first etc?