Actually, no, our waxes have not had any issues with hot climates.  We have clients in Dubai, Texas, Florida, and Australia who have shared with us there had not been any issues at all with the heat in their climates affecting the wax shipment and their finished seals. The melting point for sealing waxes is fairly high, and could possibly soften a slight bit in a very hot climate, but should not offer any issues at all.