If the mixture was off, it may never harden. I have had a few do overs
when this happens, usually when I am not paying to much attention to
how mamy pumps I used. Sometimes, depending on weather, it may take longer,
but yours shoul have hardened somewhat already. I would clean it
up and start over.
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Thirtyclean (Well maybe 29, or 28, most of
the times !)