First rule on buying a used kayak, paddle before you buy without exception.
Second Rule - All kayaks leak a bit, especially if they have hatches.
Third rule - find a good plastics Tech and use him.
I buy and sell kayaks as a avocation and find that some naturally leak more than others, if I locate the leak the YAK goes right to OEX on Mission bay San Diego, not to mention for equipment they will have what you need.
BTW when I sell I ask the people to paddle what they are buying.
Good luck
