FreezePruf: It worked
The spray is designed to protect the plant's cell walls from expanding in the cold and breaking down.
I promised I'd try it and report back.
Well, it worked!
I sprayed the annuals and the dahlia in two deck containers and waited for the first frost. That frost arrived last night, and I woke this morning to a silver glaze on the grass and on all my gardens.
But the containers were perfect!
You can see for yourself later today when I post some pictures. I have a crazy day of errands today, so I will download the pictures this evening. Check back!