I am all for a good thickness rail tape to protect the rails. I've used thin stuff like what can be used for protecting parts on cars & motorbikes. But wouldn't bother with that stuff anymore. So get a good quality rail tape.
I also tape my paddle blades with a good quality electrical tape.
My problem is that I do not re tape often enough after seeing the tape is damaged on both board & paddle.
My foilboard cops the most paddle hits both on the rails & deck. The board is showing its age but I love it. Re sale would not be worth it anymore. But I want the board to last. So I painted epoxy resin along the right side rail which I hit numerous times. And also have rail taped over that. Better than finding it gets water logged.