Flotation devices (Park forest)

I have two Intex challenger inflatable kayaks and one Intex challenger 2 2-person inflatable boat. I’ve gotten a lot of use out of them. They each appear to have a leak that I cannot find. But they each still float because they have multiple air compartments. If you find the leak it can be repaired. There is a patch kit and gorilla glue also works. I hate to just throw them away. So hop wing someone wants them to either repair or use for parts.