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Sealing cracks in basement floor

We built our new home last year in Wisconsin. It has poured walls. There's draintile inside and outside the foundation and washed stone under the floor. There are several cracks running across the basement floor with some up to 1/8 inch wide. We've never had an issue with water coming through the cracks. We would like to finish the basement, but what's the best way to seal the cracks and waterproof the floor?

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