How sensitive is rosin to temperature?

[1973PortlandToker]

I'm on vacation and would like to drive home with some good quality rosin. It may get to as high as 90F in the car at times. Will this ruin the rosin?

 

[simba]

Get a cool box if you can, it won't be completely ruined but it won't be as good as it should be.

 

[Ravachol]

The heat can cause it to melt and change its texture so if you don't have a cool box you can work with some ice cubes aswell