Nope, but now we are entering really interesting waters
When we melt things a HUGE amount of heat is required. The substance will stay at its melting temperature until it is all melted, absorbing a huge amount of Latent heat. when the temperature goes below it "freezing" point the heat is released again.
Exactly the pricipal behind refrigeration except we use gas/liquid phases.
FYI normal parrafin wax melts at around the 50C mark. Trick is to find a compound with a useable phase change temperature.
90F is 32C, and seem like reasonable temperature.
For those of you that are not fammiliar with specific and latent heats i'll give an example that pretty much sums it up, and you can try it at home too
put a pot of water on the stove, with a thermometer in it.
You will notice the temperature going up steadily until around the 100C mark. This is specific heat, the heat absorbed effects a rise in temperature
At 100C (depending on impurities) it will just sit there, obviously absorbing heat from the flame but with no rise in temperature. This latent (hidden) heat. The water needs to absorb enough energy to effect a pahse change to steam. Therein lies huge heat storage capability at a substances phase change temperature.
This is why being burnt with steam at a temp of 100C will give you far worse burns than water at 100C. The steam holds much more energy at the same temperature as the water
(2260Kj energy per Kg more than water at the same temp)
I love physics!
http://www.physchem.co.za/Heat/Latent.htm