The first test I do on a kayak that comes in for a leak test is plug the scupper and fill it with water. If the water level drops there is a pin hole. Most if not all major manufacturers have struggled with pin holes where the 2 pieces of the mold come together in scuppers. Malibu has been retooling their molds, having them come together at the top now instead of midway down. Better quality control through better design.
