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I'm curios on what the thinner is that you use for styrofoam? And do you mean like typical styrofoam that comes in cups?
the thinner is a lacquer thinner or MEK,the styrofoam is the white stuff/balls/flakes etc. you use to fill boxes/packages with fragile content.
Basicly you can use any kind of styrene plastics(plastic cups/model kit sprues) which disolves in thinner(the melting proces will be slower and the drying time longer)
Many modelers used to make their diy plastic putty this way.
You want to do this styrofoam melting in a well ventilated area and the styrene melting closed jar,..really toxic fumes!!
If you melt the styrofoam in a closed jar the lit may be blown of since the air in the in the styrofoam needs to escape.
I think you can disolve insulation foam(fresh and still "wet") aswell this way,...not shure though.
TIP,..you want keep trowing styrofoam in the thinner untill it doesn;t desolve anymore than your mix is ready to be used, if to flued the thinner is not "saturated"enough and may eat through the paintlayer or even the object you use it on.
Hey pitchforknumb,... planning to make a firebomb with this stuff?
Imagine this stuff sticking to your body while lit on fire,...jezus what a hell must that be(napalm
)