I am a woodturner and the urethene is indeed a problem. Best thing to do is leave it on the lathe and give it numerous coats of thin cyanoacrilate (CA) glue, spraying it with accelerant between applications. 40-50 very quick coats in a well ventilated shop, followed by a day or to of curing, then light sanding with micromesh pads and finally plastic polish will give that knob a glass-like and very durable finish.
I do this all the time with the pens and things I make on my lathe.
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