What size leaks? If they are pinhole, inland marine sells a product for plugging those from the inside, you remove the valves, add the liquid, put your valves back on, and fill the boat with air, then move the boat in all directions to spread the product evenly.
It is the only product of that type that will completely dry and not cause the rubber to stick to itself.
If they are bigger then pinhole the product will not work of course.
We can't always agree, but we can still be civil to each other.