Turns out I was right about the finish making it easier to sand off any runs or drips with the dye. However, what I failed to account for was that with the open grain of the cove some of the dye would seep through the edges and show up from inside. You can see it particularly at the top point of the cove. I'm not even sure how I would have prevented that. I don't know if maybe I should have just put a coat of neutral first so that that wicked up into the wood without any color? I mean it's not terrible. It's not like I'm going to throw the neck away over it or anything like that, but it is an error that I can't correct because as I continue to sand down it only gets to be more pronounced, not less. Anyway, I still think it was a cool idea even if it didn't go 100% the way I wanted it to.