We offer a custom configured KC Welder Pro that includes a bunch of Hobie color welding rods in the package. This welder has a hole in the welding foot that accepts the rod. Much simpler to use. The rod passes through the foot, melts as you push the rod through. It's shown in our catalog (Fall 2010 page 31).
72097001 KC WELDER PRO WITH ROD STOCK
3/16" TIP AND SELECTION OF HOBIE PLASTIC ROD
80 WATT ELEMENT
If you took one of those and melted a big blob of plastic down into the transom of a boat (stood on end) would it bond with the boat and make a stronger transom? Or would it be weak around the edge of the blob? Or would it not bond at all?