I had an hour and a half conversation with Micheal Harding ( the paint maker) about this and other subjects, (his nickel, thank heavens).
He recommends using ONLY the purest turpentine. He only uses mineral spirits to clean his paint making machines as it is a powerful solvent and breaks down paint very efficiently. This is not the sort of thing you want in your paint . He had a more detailed description of how mineral spirits can weaken your paint surface but I cannot at this time find my notes. He DOES not sell turpentine as far as I know.
I use mineral spirits only for brush cleaning now.
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