Has anyone used megapress to repair old galvanized pipe? I have a property with a new building and an old one. I had a leak in what I'll call the new main but when going to replace it, we uncovered the old main and caused it to leak. I think the old main goes under the new building and is connected to the old building. When they build the new building, they built on top of it and connected the new main to both buildings. I'm hoping to use a megapress cap to cap off the old main but I'm worried about the rust and crud making a good seal. If that won't work, what other options are there?