Fascal is a clear sticky backed film. I think it was developed for photo laminating 20+ years ago. back in the 80's it was commonly used as a covering for CL combat models. It has some heat shrinkage but not as much as some of todays coverings. It's very strong and added a lot of strength to the airframes. I have found it on the net but can't find a local supplier anymore. I still have 10-20 foot but that doesn't go very far when covering planes. If you can find it, I'd use it over heatshrink. At the tip speed a heli blade runs, the heat shrink can actually stretch and separate from the blade airfoil in a high load situation. This is really mostly theory but I know it happens to some degree with all heatshrinks. It may not have enough effect to ever be felt while flying but if you can use something that sticks to the blade surface it can't lift.
Later,,,basmntdweller