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3

You are correct in your thinking. The original layer, even with the holes will still add strength to your top layer. No need to patch the holes.


3

That looks like some kind of "Renew your shower with this spray on enamel!" type product over grayish tiles. You can tell because the tiles and grout are all covered with the same white material. It's flaking off in this area. To repair you would need to find a similar enamel paint to touch up the bad area. Finding a match might be hard, but an appliance ...


1

"grout... starting to erode or crumble away under squeegee action" Don't blame the sealer. Your grout was not prepared and/or applied properly. Applying a sealer now may help stabilize the grout but your best option would be to... re-regrout.


1

Isn't it a little late to be asking that question?? Get a 2x4 and run it along the framing for the concrete, smoothing it out. Even if the concrete isn't totally smooth, when you install the tile you can smooth the rough surface of the concrete with the mortar... If the slab you poured has the proper slope make sure each tile is flush with the slab and ...


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