We are installing a glass subway tile (3"x6") kitchen backsplash. Because of time constraints, we were not able to do it all at once. We just finished partof the job - of cutting and placing the tiles - when my husband realized he had mixed grout instead of Thin-Set. Is there any way the grout will hold the tiles? Or do we need to pull them all off and re-do them with the Thin-Set? And if we do need to remove them, any suggestions on how to best do that while sparing the tiles? Right now, they seem tight! Thanks so much!