I think this belongs in a different section, as it’s not about a PYO Windstone.
But anyhow… if there’s a noticeable chip, you’ll want something like apoxie sculpt or plaster to fill in the chip with.
On current or recently retired colors, Melody actually can get you a little thing of paint to match, but I’m pretty sure that shade of green isn’t available at the factory, so you’ll have to match it yourself. Just experiment, is what I’d recommend. Mix up a little paint until it looks close, cover it so it won’t dry, and paint it on a bit of paper and let it dry as a test, as dried paint is sometimes a different shade than wet paint.