Hi there - just laid new tile in my kitchen and did some grouting the other day. (used porcelain 12x12 tiles, 3/8 inch joints) One box of grout did half my kitchen and we stopped there. It's time to finish the job and we just realized we used non-sanded grout! I understand this is a big mistake with that sized joints. my questions: can i use sanded for the other half and then just go over the non-sanded with sanded and leave it at that? Or can I just keep with the non-sanded and finish the room that way? My knees, neck and back are just recovering from the pain of the first half of the job, and I really really do not want to rip it out and start over. I would appreciate advice. Thanks!