Yeah, it might cause a build up. But, what the heck, I'm going to give it a try in my Mustang. Can always hit the bore with a wire brush and blast of carb cleaner.

Did a search on carnauba wax and found that it's used a lot in cosmetics and is considered interchangable with bee's wax for many applications. It has a melting point of 180 to 185 degrees.

It might turn out to be the best thing since a sharp rock on a stick.