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It's very common for crokinole players to wax and buff their boards in order to make the discs glide along nicely. If you leave grooves the paste wax will get stuck in the grooves. :(
Hi Adam, I'm glad to hear that you found my crokinole instructable useful! Routing tiny grooves for the circles and filling them with a dark colored filler of some sort would definitely be a great way to go for long term durability. My sharpie circles keep wearing down and needing refreshed. :(