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Discussion Starter · #1 ·
Rapid set mortar will be set hard enough to be driven on in an hour.

Does it still take the conventional 28 days to cure like "normal" concrete?

I have patched a section of an exterior concrete wall with it, about 4"X4" in size and 3" deep.

How long should I wait before I drill 3/16" holes on it for a few Tapcon screws to hold up an electrical box for a wall sconce?
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