Are movie-style practical special effects questions appropriate for Arts & Crafts SE? I mean like questions about how to make realistic-looking blood, how to make a face-melting special effect, etc.
There hasn't been a definitive answer yet, so allow me.
I would say yes. There's nothing about making special effects or even props to me that would seem to be off-topic. They're specific applications of both art and craft. They would be both interesting and be answerable by experts with experience in the relevant fields.