Seasonal Use of Reemay Cloth

Does anyone have experience using Reemay Cloth with individual trees?
This site
Learn More About Reemay- The Multipurpose Fabric claims that it can raise temperatures by 5 to 15 degrees. I have wondered if it would offer significant frost protection to the root zones of bonsai moved to the ground off the bench.
I am currently using a piece of Reemay to shade foliage from late afternoon sun. It may have been my imagination - but it felt warmer when I put my hand under the fabric.
Then I wondered about the tropicals we are growing outside of their zones. Would a loose Reemay ‘baggie’ over a Jacaranda trigger flowering? Has anyone done any experiments?