SVonhof Hell, you can do that at home with a little polyurethane spray...
Probably so but you might degrade the performance. I have played "recycled" balls for years. I have always heard not to use "refinished" since they have been repainted and performance suffers. Maybe I'll ask my wife if she would shine my balls today. On second thought I may end up with two "shiners" I don't want. ๐
Something I have notice about the Volvik Vivid green is if you use one for serveral rounds without losing it and wash it a bunch of times the color will fade compared to a new one.