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I want to give a piece of plasticard a realistic blast effect by heating it. Here's an example:
Any ideas?

Soldering iron.
Heat gun.
Container of boiling water (sit sheet of plasticard in it until it softens - then poke hole with something ).

Hot day and magnifying glass.

If I wanted to replicate the picture, I'd probably get a heat gun or a hair drier, blast the area and then stab the model.

Soldering iron would be my preferred method though I reckon, as it is much more precise.

Keep in mind though, if you jab something hot into a piece of plastic, it'll probably end up with melted plastic all over it. Put something like a soldering iron close enough to melt, not right through

+ the fumes are poisonous. if you're going to do it, do it outside.