Dan, I've used Brodak's nitrate on several models. When I was ordering, They suggested using the nitrate thinner with their nitrate dope. Initially when I first used the product I was using the butyrate thinner. I then switched to the nitrate thinner they offered. I've since used up all the nitrate thinner I purchased. I then started using the butyrate thinner again. I haven't had any problems that occured. I keep a 50/50 mix in a separate jar as well. I figured it would of turned into gel but it hasn't. One problem that I've found is that they don't always keep a large quanity of the nitrate and nitrate thinner in the qts. Good luck , Ken