Definitely seal the grout. Over time, all grout darkens with age and use, but it rarely darkens evenly. The sealer helps create a waterproof barrier for your grout that prevents liquids such as floor cleaners from penetrating each time you clean. It will also help with the accidental spills. If you have any repairs (warranty or not) later...there is very little chance you can match the grout. So the sealer is your best bet for keeping your grout looking new longer!
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