we have just spent a week in Southampton sealing leaks at an important dry dock. This is a working dock with a new large boat is currently being constructed and scaffolding everywhere. We concentrated our work in one area, and the job entailed injecting polyurethane resin into porous mass concrete which is constantly subject to tidal wave waters. The walls were reported as dry and successful when we left last week so will report back later and is no doubt further work will be required. Interesting job!