Has anyone used Thermoflex on Sunbrella canvas material? Description on the spec sheet is 100% solution dyed acrylic fibers, soil/stain resistant and a fluorocarbon finish. So can it stand the heat of pressing? And if so - will it actually adhere? Or will it melt in the heat press? I've done canvas before, but it was untreated. Anyone have any insight into how this will work or if it will?