How long must grout cure before applying TopGrout? 2 hours. Yes, that’s right. TopGrout’s cutting-edge technology allows you to apply it to grout after only 2 hours of cure time. Did this answer your question?Yes NoAdditional Comments:Send Feedback Post navigationPrevious post: Is DeepSeal a good product for tile?Next post: Do you still have questions? Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.