I don't like the finish of electrical tape on the paddle so I went with tape on the board rails.
For $16.00 at Bunnings, a mega roll (25 metres) of the weave style cloth tape in assorted colours will give you a great finish and protect the board for re-sale.
I do two layers, one high and one low on the rail with the centre section overlapped.
It's also known as '100 mile an hour' tape and 48mm wide in red, yellow, white, black, blue etc etc.