IIRC according to the manufacturers there is no "glue" i.e. adhesive that will make structural joint in starboard or simialr plastics. There are some solvents, that when used properly will melt the two pieces together, but even they don't provide a joint that can be subject to much pressure, due the the thin layer that melts together. The only way to really shape the stuff and maintian structural integrity is to heat and bend it to the desire shape.