Anybody ever glued Fibre cement to concrete slab?

I have a sanded concrete slab under the house that looks awful. I have sanded and more or less levelled the concrete surface with a diamond blade concrete sander. I was hoping to get a terrazzo effect and in some places I did. However the slab has been levelled up with mortar and levelling compounds in places and the look of this is pretty crappy. there are also a few divots missing out of the slab here and there that were only revealed during the sanding process.

I was considering tiling over but really don't want that expense or work load.

So I have a bright idea - glue down 6mm fibre cement sheets, sikaflex the joins, then clear seal the surface. Nice smooth and durable. The glue was going to be cement based tile glue (for economy).

Has anyone ever tried this? Did the sheets stay down?


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