Those with passionate views about how much to tip the pizza-delivery guy, please see the information in the footnote provided by two other sources. (For a look at the real reasons we tip and whether tipping has anything to do with the quality of service we receive, click here.)
Liquid Grout Sealer. 1  1. Allow new grout to cure for 48 to 72 hours before sealing. 2  2. Tape off baseboards and other nearby surfaces to prevent unintentional staining. 3  3. Apply sealer using a foam paint brush, paint pad or a small roller.  4. Wait 5 to 15 minutes to allow the first coat to soak into the grout.
ZEP Commercial 32 oz. Grout Cleaner and Whitener is formulated for use only on floor grout lines. It cleans and whitens grout and removes light rust stains off concrete with little or no scrubbing. It is not recommended for marble, stone, metal or Corian. Use only for cleaning and whitening floor grout lines.