This reply nails it! Nitro is the clear coating lacquer on top of any paint or stain finish. The nitro is no different on a GT, than any other nitro over other underlying finish. Poly clearcoat is very different and arguably affects playing/sound. I only know this stuff because I once re-finished a LP Tribute to a GT.When you consider all the factors that contribute to the overall tone of a guitar, in proportion to their actual observable impact, I am inclined to put things like pickups, electronics, strings, and setup way, way above things like the paint used underneath the nitro. Sure, "everything has an impact," but not everything has equal impact, or even noticeable impact apart from what we convince ourselves we notice (humans are notoriously poor interpreters of complex stimuli).
Besides, the title of this thread is focused on the impact of the nitrocellulose clear coat on Goldtops, not the gold paint, as if there is something special, unusual, or different about it.