I'm considering doing SMP but would love to do a trial run with some sort of concealer product, if one is available. I've seen Vin Diesel in a few movies where he had what looked to be a full head of hair, just shaved.. then in real life he looks like he's a NW6-7. How does he pull that off? Is there any sort of product that can mimic the shaved head look available to the general public?