Quick update:
It seems the rumours of timber binding are not to be unfortunately (on this model anyway). I'm actually glad as I was worried about stain leaching into it.
This is what it looked like
as you can see, looks like wood grain.
It's just really roughly sanded. I scraped a bit to see what would happen, and what do you know, perfect curls of ABS and smooth as.
Oh well, it might pay for Adam or DB to check out the other new quilted kits for similar results as, at least, the new PRS has timber binding listed as a feature.
Like I said, this is actually a positive for me, no more worrying about trying to mask it off.