You can also make the repairs with epoxy patching.
Epoxy to repair a chip in a marble floor.
Step 1 blow some compressed air into the crack to blow out any dust or debris that may have settled into it.
How thick or how many coats of a topcoat required depend on the amount of flakes used.
If you use fresh mortar allow the repairs to cure for at least 60 days prior to recoating with epoxy.
You will have to work quickly before the epoxy starts to set.
Use an epoxy that comes in two parts and mix them in a clean bowl according to the directions.
Make sure that the hole has been fully cleaned and prepared prior to filling the hole with epoxy.
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When the coating is tack free and ready to be re coated excess chips are cleaned off the surface and one or two coats of a clear topcoat are applied.
Because marble typically has so many veins and fissures in it a crack can be repaired with an epoxy compound that will blend in with the rest of the surface.
This is the easiest method to repair a marble floor that has a chunk taken out of it and is missing.