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DY-mark is just a sandy textured spray on paint. It's just something I've seen used in the past to give a bit of texture under the top coat (anti-slip). You could use anything you wanted to really?
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Hi, how knackered is the stock (photo?).

If getting it back to a nice oil finish is going to be impossible, and finding a replacement is proving hard(?) then one idea could be to use a fibreglass...