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I picked up some 511 impregnator for my granite countertop. I want to do my travertine floor as well. They have a 'porous surface' 511 product that seems like it would be right for the job, but the stuff is pretty spendy. Any other recommendations? (Cost isn't the issue, I just want to get the right thing for the job)

The floor was previously sealed at install, about 18 months ago. Don't know product, but I know the tile guy gave me an option for something with a little more sheen that would darken the floor up just a shade. I would like to duplicate the results.

Any help appreciated.