thanks. I tested it in the backyard by running a hose over it and it appears that water didn't get in. Not sure how I got so much in there in the first place. Guess I'll use it again hopefully I don't sink.I assume you have a sit-in yak. If so, put it up on some saw horses and run a garden hose put water in. Look for where water is leaking out.
As to sealing it, if it is plastic then you'll need to either plastic weld or get one of the special kits made for repairing plastic.
Try this stuff. It apparently works wonders.