Snowboard Re waxing? ................?

You do not have to sc the old wax before you put new wax on. You should use an iron, the correct wax for the temp. where you will be using your board, a scr, and a buffing brush. You should sc the all the wax off after it cools & buff your board. I would suggest that you save your pennies for a week or two and take the board to your closest shop. They will wax it for less than $20.