Okay, here is an update. I made up another batch of the copal. got the nice, clear, yellowish liquid, decanted it off, let it sit until thickened. Then I mixed the turpentine with the linseed oil, and added it to the copal. A little thick, but seemed okay. Then mixed the japan dryer with the red oil, added that, and bingo! It turned to jell again. It even seems to separate the clear oil out. So, I'm thinking it's the japan dryer. Is there something else I can use instead? Or, could it be the red oil? It's one of the two. Thoughts?
