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Thanks. The underpainting is 1 part burnt sienna, 1 part Liquin Original and 3 parts pure gum turpentine. I apply it as a thin wash and leave it to dry for a couple of days before I paint on it.

Thanks! I might try that one next time. I haven't tried mixing in liquin, I only tried Sansodor. Can't stand the smell of solvents lol