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Unread 02-22-2021, 06:08 PM   #2
Moderator -- Mud Man
Davy's Avatar
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 33,282
A penetrating sealer is what you want to use on grout but it's not like painting a protective coat on a piece of wood. The sealer soaks into the grout but allows it to breathe. I've sealed probably a few hundred showers, mainly from builders and designers saying it really needs it. I didn't seal my own shower.

Mold feeds on the soap film, keeping it cleaned off goes a long way. Even though I don't do it, a lot of folks recommend wiping the shower down after each use and I can see that helping as well.

I wouldn't silicone over the grout. If I plan to silicone the corners, I avoid getting grout in that joint. Any grout that I get in it can be raked out while washing. Then add the silicone after the grout sets.
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