This super professional two part glue has been specially developed for waterproof exterior use meaning that it is impervious to water this glue is so waterproof that boat builders use it developed for the marine industry this is the only completely waterproof adhesive that will withstand continual immersion in water for use externally where extreme weathering will take place fire resistant to class 0used extensively for bonding difficult timbers such as teak ideal to use for structural timber la