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Cheap pourable material that will hold up against a vacuum? Answered

I'm looking to make a buck for vacuum forming using pepakura. I would like something I can then backfill the pep with something cheap (and preferably light) that will hold up against a vacuum. 


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Best Answer 4 years ago

plaster of paris - cheap simple to use and if you support the paper well it will be OK.

NOTE plaster is heavy and wet, ensure your paper pattern will survive the process.

Beyond that you could try squirty foam as use in the building trade. It should be hard enough to vac form over.


Answer 4 years ago

I've dug a bit, and people tend to say plaster doesn't hold up beyond the first pull. I may still give it a shot, for science.

I did think about the foam as well, and had my doubts. But, with another saying it might work, I'm a bit more willing to give it a test run!