Wondering what options there are to enhance a travertine floor that has already been sealed. Our floor was sealed with Dupont's Bullet Proof about 2 yrs ago. The existing sealer is still working, water does not get absorbed by the tile. Nevertheless, we tried a test area of applying the enhancing sealer to the tile, just to see what happened. It actually appeared to work, the tiles appear "enhanced" compared to the ones with only the Bullet Proof. Before we go forward, wanted to see if those in the know think it is ok to apply the enhancing sealer on the previously sealed tile, or if there is another option to get that look that the enhancing sealers provide. I see that Bona Kemi has a "polish" for natural tile, which sounds like it might do the trick. Any suggestions would be appreciated.