Waterline Tile Grout Repair


Well-known member
Mar 8, 2017
Largo, Florida
I have a very small section of waterline tile, maybe 6 to 8 inches long, where the grout is chipped out and missing. All the rest of the tile grout is fine, so not sure why this one spot has an issue.

Attaching a couple of pics

I'd like to repair it and hoping for recommendations or experience with specific grout products that have been used with success. I'm weighing the pros and cons of the following:

1. Traditional modified and sanded tile grout
2. E-Z Patch® 22 Neutral Cure 100% Silicone Rubber
3. Novagard RTV 700-164 Silicone Tile Grout

Don't want to buy a giant thing of sanded grout just to do this little area, but I will if that's the best option. Also, someone I know suggested maybe I re-seal the rest of the tile grout while I'm at it. I have some "regular" tiling experience (e.g., showers, etc.), but not pool tile. Is use of a traditional grout sealer a good idea/recommended in a pool application?

Thanks in advance for any input!


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
I would not use a silicone based product.

I use E-Z Patch® 4 (White) Pool Tile Grout Repair - E-Z Patch for grout repairs.

You should go around and fix any hairline cracks in the grout. I don’t use sealer on pool grout.



Jul 7, 2018
SE Louisiana
I recently repaired some missing grout and cracked tiles. I used the EZ Patch 3 to reset tiles and EZ Patch 4 to grout. I added a little concrete dye from Home Depot to the grout mix to better match the surrounding grey grout.

FWIW: I have never done grout work before; I just watched their videos and followed instructions. It was easy and turned out great.


Well-known member
Mar 8, 2017
Largo, Florida
Thank you so much, AJW22 and Mpire for the recommendation/endorsement for EZ Patch 4! We've had a ton of rain here on the Gulf Coast of Florida the past few days so I didn't get to this project over the weekend as planned. But I'm hoping to tackle soon and I'll try and let you know how it goes.

Thanks again!