Silicone based products get a bad rap in my book, but not for the reasons m ost don't like it. It started years ago when it was touted as a product th at would seal any surface, could be used as an adhesive, would work for all kinds of minor repairs, and was the must have sealer/adhesive/caulk/waterp roofer for repair and remodeling.
Then we find out the hard way (NO warning from the GE people 40 years ago) that silicone sealer isn't UV resistant. So all the sheet metal flashings that have been sealed with this will leak in about 3 years.
We didn't know that surfaces to be sealed had to be PERFECTLY clean. Any t ype of surface residue will prevent a good seal.
No one told me it wasn't paintable. So with the really nice paints that I use that will adhere to motor oil (just a joke...) they would stick to the silicone, but peel off later.
Found out it worked reasonably well as an adherent, but did not penetrate c ertain surfaces well enough to call it an adhesive.
Result: No silicone product in the truck or on the job for the last 25 yea rs. There are much better products out there for each one of the tasks men tioned above, and they are a lot less money, too.
I see now they have different products that correct all the problems I had long ago, but on examination of the tubes I found at HD, they still don't h ave one product that is UV resistant, mildew resistant, paintable, etc., in one tube.
No thanks. I like PERMANENT repairs, repairs that I walk away from and nev er think about again.
If I was replacing a tile, I would use DAP with Microban. When do a tiny r epair like that I get the small tube in the correct grout color and glue it in, then use the DAP as grout.
As far as the problem with the glaze on the tile, no need to reiterate good solutions.
Robert