My 2 brothers and I were little pyros when we were much younger... Styro was one of the things we used to play around with. I can tell you that you dont wanna put that directly against any kind of heat. Things will go bad quick, or good if that's your Goal.

In the other hand, if you put gasoline on it, it will melt into a paste kinda thing and will harden when dry. Home made temporary sealant!