15 oz. 511 Spray-on Grout Sealer

A:  Happy to help, William! Rust-Oleum Miracle Sealants 511 Spray-On Grout Sealer will not harm ceramic tile, and it can be used in showers. - Rust-Oleum Product Support 3

A:  This is the best product I have found to seal grout but I still get a some spots spots even though I use a squgee and wipe down the walls after every shower.  I also use a strong concentrated grout cleaner called Tile and Stone Cleaner made by Miracle Sealants Company to clean grout first. You may want to try a steam cleaner first then let dry thoroughly for several days before applying the sealer 

A:  Thank you for reaching out! Yes, by sealing the grout, this will make it more difficult for mold to take root in the porous grout, preventing growth in the grout line of the tile. - Rust-Oleum Product Support 2

A:  I can’t say. I got it to spray on grout in our entryway. There’s been no mold, but it really has protected it well from crumbling. Whether it’s this spray’s fault or the grout’s, I don’t know. 

A:  Thanks for reaching out, James. When using Rust-Oleum Miracle Sealants 511 Spray On Grout Sealer, protect neighboring surfaces, including wood, carpet, metal, landscaping and other non-masonry surfaces. - Rust-Oleum Product Support 6

A:  Happy to help! Rust-Oleum Miracle Sealants Spray-On Grout Sealer can be used in a shower to seal grout and will not alter the appearance, and can also be used on marble. This product can also be used on grout lines wider than 1/2"; the width of the grout line is not a factor in the application. Once the grout has completely cured, hold the spray nozzle 6" away from the grout and spray 511 Spray-On Grout Sealer along the grout line. Wait 3-5 minutes then use a clean, white terrycloth towel to wipe away any excess sealer. Allow to dry 2 hours. If water still absorbs into the grout, a second application is required. - Rust-Oleum Product Support 4