Here is a clip of Ricardo interviewing Lodro Dawa of Monkcraft Kayaks. Lodro pounds on one of his boats with a hammer to demonstrate the strength of skin-on-frame construction. Damn, those boats are tough! I never had the courage to try that hammer trick on one of my own boats, but I bet they'd come through with hardly a scratch. Lodro uses nylon coated with Corey Freedman's Spiritline "Goop", an incredibly flexible and abrasion resistant two-part urethane specially formulated for skin-on-frame construction.