The type of solution needed depends on the type of water infiltration you are dealing with. If for example you have water coming up through cracks in the floor, which could be due to a high water table and resulting hydraulic pressure, you may well need a heavy-duty solution such as an interior French drain system. On the other hand if it's just a minor bit of weeping through a wall crack, the coatings mentioned may do the trick.
One of the other posters had some good advice about looking over your drainage situation as that can make a big difference.
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NHskier
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