Quote Originally Posted by Mohawkshaver1 View Post
What is TNT?
Thumb Nail Test

Wet your thumbnail and use only the weight of the razor drag the edge across the nail.

If it slips there's no edge, It should 'grab' as it's dragged over the nail.


Glen shows it here:If you want to skip some of it go to 2:30 that's where he First shows the TNT