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How to seal travertine 
Test whether sealing is necessary. 
Polished travertine often doesn't need sealing, but you don't need to guess whether or not it's a good idea. It's easy to test whether sealing is required by dropping a few drops of water in a few inconspicuous areas.

Pick from: 1). Once you've accepted a stain, you can go ahead and seal the entire stone floor. A drop of water won't begin to remove stains unless the stone floor becomes saturated.. 2). Let the water stand five to ten minutes, then blot dry. If the travertine stays darker in color for more than a few minutes, sealing is probably a good idea to protect it from other liquids that could leave a permanent stain.. 3). If you notice one drop washing into a remaining area, it's probably safe to keep your travertine clean. If you see a drop or two traveling to another area, it's safe to leave your travertine clean.. 4). Dry travertine with a drop of liquid topcoat or a touch of water. Once the travertine has dried, dry it with a drop of liquid topcoat so it shines, not drips..
Answer:
2).