- Polyurethane foam is an excellent way repair leaks in manholes, sewer lines, and storm drains. The foam is minimally invasive and environmentally friendly. The materials are lightweight and after only 15 minutes, it’s already 90% cured and 100% after 45 minutes! A hole is drilled in order to intersect the crack and insert the resin. Once the resin interacts with water, the crack is sealed and the leaks have stopped!
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