Sex 3.0 C4S upgrade

[joralieu]

What is black nitro?

 

[kgoss]

Nitrocellulose lacquer. 
I have used and like the Mohawk brand which I get from Klingspor's Woodworking Shop.

 

[Paul Birkeland]

What is black nitro?

If you go to the hardware store and there's a spray can that says "lacquer" on it but doesn't say "polyurethane" or "acrylic" on it, you're good to go.