These four glues were all used in my truck rack, about five years ago, as an experiment. The weldwood and the gorilla failed miserably. The epoxy and recorcinol held well. The rack was under the worst possible conditions, out in the weather and continued wracking forces every which way. It finally failed on the way to Port Townsend, and I had to tie it in place. Needless to say I'm in the process of a new one, with sturdier construction.