One word of caution, the product in the video, MIGHT result is a very slippery floor, something you do not want. Tile for flooring actually has a rating for how slippery it gets when wet. We used a product that was supposed to seal, WITHOUT CHANGING the color of the grout. I am not happy with the overall results, not sure if I screwed up the application, or if the product just does not work as advertised.
Many of the 'sealers' make the grout look like it is wet all the time, and you may not like that look, so be sure to ask whoever you decide to use what the final product will look like. Also, if they are coating the tile as well as the grout, make sure that they add an anti-slip product like shark grip to the floor finish.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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