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This technique involves an interior surface seal on the leaking concrete element. Water is controlled on the interior concrete element face; however, the void remains filled with water. A simplistic, first attempt is to paste over a leaking crack/joint with a high viscosity, elastomeric, compound. This paste should typically extend over the crack/joint one inch and the paste should be about 1/8-inch thick, sometimes it is reinforced with a scrim or mesh. On some occasions this may resolve the leakage problem long term, provided cracks are static; however, in most situations, this solution is generally short term in performance. Costs vary, $5.00/LF is common, plus mobilization.