Pebble plaster in high Arizona heat?

I have been trying to get my PB to plaster my pool for months. Material shortages and the fact that he is not making much if anything on my job has left me without a finished pool. I recently told him to just pay the (double normal) price for the only material apparently available which is essentially radiant fusion without pre-mixed cement. I'm tired of being told maybe this week the plaster crew will be available.
It is been 100-103F here and my job is a larger than average pool. If...

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