West Systems 3 is a line of interchangeable products. West systems = sytem 3.

Gluv-it is a two part epoxy mixture that folks will put on the bottoms of their boats to prolong the life of said boat bottom. It also helps slide over rocks better. It is used on wood and many metal boats. Not sure about glass boats.

I have 3/8" of wood on the bottom of my boat + 2 plys of 10 oz. fiberglass including two wet coats + three epoxy coats with graphite + anywhere from 1/8" to 3/8" of gluv-it, depending on the area.

Pails of Gluv-it are about $60 at Boater's World.