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Polyurethane resin is the arguably the second best repair for a leaky concrete basement foundation wall. Polyurethane, when injected, can fill the entire crack of a cracked concrete wall up to 24 inches thick. The difference between an epoxy injection and a polyurethane injection is that the polyurethane injection can be done in a wet crack. Polyurethane doesn’t add structural strength, it just creates an impenetrable barrier that water can’t pass. When injected, polyurethane resin bonds tenaciously to the dry or wet concrete. Polyurethane remains flexible so that when the concrete shrinks or expands due to thermal heating and cooling, it can breathe. Polyurethane is typically the second best method of repair; however, it’s the same price as an epoxy injection. The main difference is that polyurethane can be injected in a leaking or wet crack while epoxy should not.