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Also forgot to mention once the griptape is flat on the deck, you should cut from the bottom up, running the razor along the board at around a 45 degree angle. Or another option that I recommend over the previous is to use a hand held file. If you have one, this will give you the cleanest cut. Run the file along the edge of the board filing down the grip tape, you will see it prepares the grip better to be cut and ensures that the cut is straight and along the edge of the board.
Tribal LongboardView Instructable »