It's 16 degrees outside and I'm worried about some of my more cold sensitive plants. My rhodos are curling and everything just looks...cold.

I just heard about something called FreezePruf and I'm wondering how well it works.

Liquid Fence—the deer proofing spray people—have introduced this product and it claims to raise the freeze tolerance of plants by up to 9.4 degrees. According to the manufacturer, it's like moving your plants 200 miles south. 

FreezePruf is water based and purported to be eco-safe, biodegradable and safe when used as directed. They refer to  it as "anti-freeze for your plants," which doesn't really appeal to me since I pretty much associate anti-freeze with dead pets and water pollution, but that's just me.