Just in case anyone was thinking of using it and is it any good. I used it today for the first time on 7 J/B's. All going to be buried under a patio. Although pricey I thought it was great stuff. Obviously it will take a lot of time to tell if any water creeps in in but from what I saw today it looked as tight as a ducks arse in a sandstorm. Quiet happy that my boxes will be safe buried out of site.