Grout Sealing Made Easy by Bobby Walker -
Before sealing your grout, wait at least 24 hours since you have acid washed the floor. If not, the sealer will not adhere to the grout correctly. Also, make sure you are satisfied with how the grout looks, once the seal is applied it will be too late to change your mind. Of course, you should not be sealing your grout unless you have acid washed the floor first.

Not many supplies are needed for this job and there is a good chance you have everything on this list except for the sealer. Buy a good quality sealer, somewhere between $50 to $100 per gallon. It will hold up much longer than the cheap stuff. Measure you floor and buy more sealer than you need, you can always get a refund on extra bottles. Before you start, tape up any surface you do not want the sealer to contact. Also, make sure your mustard bottle is completely clean! I would wash it a few times so there is absolutely no mustard in the bottle or the spout. T ... Read more »