Wascamp,
Nitrate dope comes in taughtening and non-taughtening. Builders of full size aircraft use products from Randolph Products, Certified Coating Products, and Classic Aero. These products can be seen at
www.aircraftspruce.com. This company is also a good source for sitka spruce. Check out
http://www.aircraftspruce.com/catalo...tratedopes.php for Randolph Products line of taughtening and non-taughtening nitrate dopes.
Jim