So, more sonic blue paint ordered, of which several coats will need to be applied and I probably won't bother with any clear now.
Well, on the upside, there should be plenty of coats of colour down to prevent sand-through to the timber.

I too have had some issues finishing the LP neck I recently posted about in another thread.
There were a few tiny gaps between the binding and timber on the face of the headstock, which I thought would in-fill with enough coats of poly... I was wrong. Then, in my attempt to fill them with CA, I only made things worse. So sanded back to bare timber; re-stained; and have started re-spraying the poly.

Good plan, right???
Well for some reason I'm getting some weird pock marks in the satin poly! It's not orange peel (which I have never had with poly anyway). Not sure what's going on. I've played with the pressure, air flow, fluid flow etc. The gun is clean as a whistle, the batch of poly is brand new. Good news is he last coat of the day seemed ok, but I will need to level sand before doing more coats tomorrow.

The upside for my situation is it should come up better than my first application would have. (providing tomorrow's session goes smoothly )