Is there grout there? WIll there be overspray from some boy children? Or guests? Or DH? Um hmmm. Sealer. And don't forget to keep it sealed. It's not a once and done project. Every time you clean, you will strip a bit of sealer. The harsher the products used to clean, the more sealer they strip. If water doesn't bead up in those grout joints, it's time to be resealed.

well, i did the first coat and it was not bad at all. but i think it was partially easy because i didn't "apply liberally" enough!so the there wasn't much to "overflow". i guess a floor is easier than backsplash, too, because of gravity! i will try to go heavier on the 2nd coat. good idea about cutting up the rags - i used an old hand towel and it "whipped around" a bit -- plus i couldn't remember which part i used already! round two in about an hour. thank you both - you gave me more confidence. :)

Thank you, everyone, for your help. The beveled edge 2" foam brush worked best. It did get "mushy' the longer I worked with it which caused the sealer to spread onto the tile and have to be wiped off, so my "note to self" is to buy several and rotate through them next time I need to seal this grout. Done!!

I used Miracle Sealants Grout Sealer on my white unsanded grout in the bathroom of my beach cottage. It is, I believe, the most purchased grout sealer in the US. It says it will not change the appearance of the grout, and I believe that to be true, although that wasn't my focus. It is available at the big L and HD. You can always try it in a small area, wait for it to dry, and see what you think. There is a brush tip to the bottle and application is easy, if a little tedious.