Permanently repairs holes, gouges, cuts, rivet leaks in aluminum boats and RV's. Seals leaks in fuel and water tanks and lines, pipe joints, drain, exhaust lines, manifolds, and mufflers. Repairs cracks in outboard-I/O lower units and outdrives. Cuts through oxidation and anoxidation to enhance ability to adhere to old aluminum. Works equally well on other materials including fiberglass, wood, other metals and ceramics. Mixes easily by hand, like modeling clay. Sets in 30 minutes. Can be sanded, painted, drilled, tapped, and filed. Will not shrink or pull away. Resealable tube prevents dry out after opening.