I took a look at my one Baerreis fork, and it feels waxed to me. Oil over wax won't adhere unless the wax has worn off. I checked their etsy shop, but they don't seem to say what materials they finish with. Carnauba wax is a really common finishing wax, I think Jetter uses it. If you think the Baerreis needs to be refinished, I'd go with a wax, but it is probably fine unless it is showing signs of wear.
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