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Hello Mike,
Just a thought, we did a basketball area a couple of years ago at this time of year. We covered it with some plastic and old blankets to prevent any water component freezing before it cures properly. It sounds a bit excessive and may be rubbish but it is forecast for -1 tonight; probably even less out of town.
BTW, I'm really enjoying watching the process and suggestions as I'm planning a ROR obs at the moment, and thus far it's a pretty similar process (except for the shape of the slab!)
Cheers,
Bruce
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