Can't Sink - By C. T. Allen. Hull of Can't Sink normally floats high and dry. If the hull becomes swamped, however, air chambers built into each seat keep it afloat. Here's the sturdy, lightweight, fishing dinghy you've been looking for. Frames are encased in fiber glass, thus making each frame member a rectangular beam, and the color goes all the way through so you'll have no hull painting problems. Between the hull's interior and exterior layers of fiber glass is a layer of 1/16-in. fiber-glass mat, the whole, bonded together with polyester resin to give you a sturdy, leak proof, lightweight boat. For safety's sake, air chambers built into each seat give approximately 3000 cu. in. of air space within the hull.