I just bought up some Dharma silk and bought a gallon each of Randolph clear dope and thinner from Aircraft Spruce. I've read enough to not mix manufacturers products - I think the thinner was actually more expensive than the dope. Total with shipping came to $107 to NY State. I also noticed Brodak was bailing on their Randolph colors so I bought 3 or 4 pints at a pretty good discount for future projects.