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You can seal a concrete slab by cleaning the surface, filling in any cracks, etching the surface, applying a sealer, and letting it dry. Concrete slabs don't typically need sealing, but you can use a topical concrete sealer if you notice signs of water damage. If you haven't already fixed the cause of the leak, then you'll want to repair the plumbing before you seal a concrete slab.

Epoxy paint is a popular option for concrete due to its durability and stain resistance. You can also use masonry paint, which adheres well to concrete. Acrylic paints are more affordable but not as durable. Concrete stain is another option, which is more durable than paint and won’t peel over time. 

Unlike paint, concrete stain won’t peel off. Instead, the color absorbs into the surface of this porous building material. While it doesn’t peel, the stain only penetrates the top layer of concrete, and as the top of the concrete eventually wears away, so will the stain. However, this process is much slower than paint peeling, especially on low-traffic surfaces.

Concrete is extremely porous. Without a proper sealing, it will absorb just about anything it comes in contact with, including water and ice. During the colder months with freeze-thaw cycles, this could cause the concrete to crack and become damaged in other ways. You always want to seal your cleaned concrete surfaces after they’ve completely dried out.