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Yes. So-called “floating” cork floors can be installed over concrete subfloor, though a polyethylene vapor barrier is required. This type of installation is achieved using the glue-down tiles, which are trickier for a DIY approach, so consider calling a professional to help you if you’re planning to install your cork floor over concrete. 

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.

You should sand concrete before painting, as it helps remove any irregularities and pieces that stick out from the surface. This not only helps the paint look better but it prevents any unwanted water absorption.

The best time to seal your concrete driveway is sometime in the spring and fall when the temperature is above 55 degrees Fahrenheit. Keep an eye on the weather, and be sure to pick a day without rain on the forecast for at least 24 hours. Lastly, be sure you can leave the space free of foot and car traffic for the full drying time.