Well Nonc, I can't say that I "know" why bee's wax is used rather than something else. I do know that some of the reasons are as follows: bee's wax will never dry out and get hard and "crumbly". That's why you never what to use parafin ( sp ? ) wax. It does crumble. The bee's wax is also a sealer as well as a fastener.
I suppose that the extreme heat you're having there could cause the wax to mmelt a bit, if left outside long enough. My experience is that this happens most often when left inside a parked vehicle, where the temperature is "amplified". I suspect though, you're not going to sit outside in the direct sun and play your instrument for very long, in 112 deg. heat ???
Better stay inside with A/C and ice tea
Jude