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Be sure that the tile is completely dry and that no soap scum remains.
...grout should "cure" for 48 to 72 hours before the sealer is applied. Even if you are sealing old work, be sure that the surface has been dry for 48 to 72 hours...
MARY H, please do NOT seal before grout has cured. It's the wrong thing to do.
I think woodbridge Is right on track and you may has missed Mary's comment that she has waited 4 weeks already.
Perhaps Woodbrige should has started his post with...."you do not have to wait any longer to
Woodbridge's statement " you do not have to wait" IS incorrect. Another poster, Nichter, also said it's okay to apply immediately. I wanted to be sure Mary did not waste her energy sealing to quickly.
I remember well that it used to be the standard recommendation to wait 3-4 weeks first, but the industry has come a long ways since then.
Here is the deal - grouts are portland cement based. they cure by a chemical reaction that begins the moment water is added and the cure continues for eternity, tho about 90% of the cure
The older sealers would interfere with the curing, but the newer water carried ones can actually combine with the existing chemical reaction and make it harder.
The BUT is that incompletely applied sealers done to soon can cause discolouring in the white grouts. That is the main reason why some makers still print to wait 2-3 days. They do not want to be blamed for the inadequacies of the person applying the sealer. Certainly when it is possible to wait, that can be the safer choice from a color POV but for sealing ability, doing the next day is fine