Sea kayak building plans built via wood strip and stitch-and-glue. also offers, materials, accessories, and manuals.. A kayak is a small, narrow watercraft which is propelled by means of a double-bladed paddle. the word kayak originates from the greenlandic language, where it is the. How do i find and repair air leak in an inflatable boat, kayak or raft? if you are losing air pressure, (aside from pressure loss.