I'm asking this here because it applies to all the plastic parts on hand tools and machines. I'm restoring some hand planes that have plastic parts. I've sanded and polished the plastic parts and now I'm wondering if I should cover them with a clear coat of something or just leave them unprotected. It seems other plastic parts on machines of mine have had some kind of clear coat, but they are awaiting my decision to coat or not.
If they should be clear coated, what would you recommend I use?