Amazon.com : Kayak Aluminum Rivets, 3/16" x 1" (4.8x25mm), Pop Tri-Grip Blind Rivets with Waterproof O-Rings - Fastener Nails for Pad Eye Canoe and Boat Accessories (30Pcs Rivets) : Sports & Outdoors
Waterprothing all under waterlevel seams/rivets from inside Aluminum hull | Boat Design Net