What's the edge taping trick? A bit more detail or a pointer to the thread would be awesome as I am about to wet sand and polish my tele.
I also don't know whether Cabothane spray can poly tends to yellow overtime. Because I was uncertain I ended up using clear lacquer on the neck because of the blue in the headstock decal.
As for testing on scrap timber, I guess it depends on how long you are prepared to wait before reaching a conclusion.