Well, the good news is that the rosin sealant had not hardened at room temperature overnight, so I must assume that there is at least the required minimum amount of castor oil in the mix. It's certainly very thick as it is - thicker than shellac, certainly. I tested a tiny amount of the goo on a ballpoint's threads, and the results were encouraging... A picture says a thousand words, as the saying goes. Here's 7 minutes of pictures at 30 frames a second!
I'll finish writing this post, and apply some of the rosin based sealant to the threads of the Jinhao 321 shown in the video - I'll be sure to let you know how it works out in future posts.