I've heard stories of blade tape splitting and lifting that have made the helicopter virtually uncontrollable. Worryingly, the pilots didn't know the cause of the problem until after they had made an emergency landing.
Having said that, there's blade tape and blade tape. Some looks like little more than strips of Sellotape, whereas others are like Armorfend with sealant around all the outside edges and joints.
It concerns me that direct sunlight on the tape, when parked, may soften and damage the material and adhesive.
I'd be interested to understand the relative merits of blade tape.