Funny thing is that while grouting I felt sort of Grumpy. I thought I must have breathed in a little grout as I was mixing it, because I got sort of Sneezy, my eyelids got Droopy and I started to feel Sleepy. My wife wanted me to go see the Doc, but I felt sort of Dopey over the whole issue. Plus seeing as I'm a little Bashful, I just finished the job and went home. That's okay-- the real problem was probably DWARFED by what you thought it was!

One of my siblings started that profile, I don't keep tabs on them. I started mine roughly 4 yrs ago under a different name. Nice try though. Kelly (cx) gives good info but even he makes mistakes and we've gone behind him to fix them. (We live in the same town) If I'm correct, he does Schluter showers..or is it Kerdi? We don't deal with those products so I'm not sure. He's a nice man and he'll talk your ear off. Last time I saw him, he came in inquiring about what type of adhesive to use for a product. That was years ago. And yes pippabean, I only recommend standard sanded grout for the wet floor of the shower. We mainly deal with traditional mortar beds in the shower, these beds have pan liners in them. The pan liner is there to collect any water that escapes the drain into the mortar bad. A standard sanded grout is needed to allow this moisture to escape properly. Upgraded grouts like epoxy and single component grouts do not allow moisture or gasses to pass through, trapping the moisture in the pan liner. --Now, hindsight is foresight and I should have asked if the OP knew what type of bed was installed. (most homeowners wont know) But then again, I will still only recommend sanded grout. We've been down that road and I sure as heck don't want the OP, or anyone else, to go down that road. That could easily be a $1000+ repair. We've been in business since 1971. We've made mistakes and we've learned from them. My goal on this site is to offer advise and hopefully steer that consumer away from a costly mistake. In the end, it's their choice.

The latest research suggests that sealing marble in a shower creates more issues than it prevents. Your tile professional should be aware of that, and the ongoing experiments. As well as the issues with using epoxy with natural stone. It’s very concerning hat you are posting here instead of working with him for answers to your questions. It suggests that he doesn’t know the answers, and thus is not quified to be doing your job. Further statements just confirm this. You might want to reread the specs on the Red Guard. More is NOT better. You are out of spec. And read the TCNA manual. Not following manufacturer’s installation instructions puts you outside of industry standards. Re vet any tile professional who would do that. Before you let him touch any of the rest. Because starting over now is better than staring o er after an installation failure. https://www.custombuildingproducts.com/TDS/TDS-104.pdf https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer

There's only one right answer: silicone at the intersection of two planes. And if your tile guy doesn't know this, he's incompetent.