PolyFoam casting

[piggy989piggy]

Hi,

So I almost finished the body of my MissPiggy replica,and I wanna start making the head,now the original head is casted in foam latex,but unfortunately,I cant have a stove for baking it,so I was wondering if casting in polyfoam that doesn't need heat is an option,if it is possible I'd love some links for tutorials of how to run it,and links to somewhere I can buy it from