Does Quick Fix go bad?

Does anyone know how long Quick Fix will keep if it were placed in a duffel bag and then left in a vehicle? I know you can re-heat it as many times as you like, but I'm wondering about extreme temp fluctuations.

Where I work, they test if anything happens that causes any damage or you get hurt....even a bee sting...and the lady that tested me yesterday said she's had guys come in who had just gotten their tires in someones grass and made a mud rut. So I want to always have a bottle close by and don't want to have to keep it in my drawers all the time. I'm just wondering how often I should toss the unused QF and buy a new one to replace it with, or maybe leaving it in an overnight bag with a change of clothes is a bad idea altogether.

Thanks for any info and suggestions.