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May 15 at 20:17 comment added John except foam and vacume do not mix, it should blow itself clear before it can harden. If it can outgas its not airtight nor will it stay even functionally air tight long enough to harden. It will certainly be better than nothing but it will not be air tight.
May 15 at 13:45 vote accept Bubbles
May 9 at 16:46 comment added Escaped dental patient. They capture the imagination, don't they. @Pica
May 9 at 16:41 comment added Pica @Escapeddentalpatient.I was more orientated towards the knife missiles of the culture, but lowtech.. lucray.artstation.com/projects/dOk3qW
May 9 at 14:57 history edited Escaped dental patient. CC BY-SA 4.0
Slight addition.
May 9 at 12:33 comment added controlgroup It's terrifying that that's even a thing that was considered - repairing catastrophic damage to the most advanced piece of engineering and architecture and science ever constructed with chewed gum - but yeah, for small holes, the actual force sucking air out is small so it'd probably work in a pinch.
May 9 at 12:32 comment added Escaped dental patient. @controlgroup I'd indeed read something related about chewing-gum and holes in the international space-station - bizarre I know, but informative.
May 9 at 12:31 comment added Escaped dental patient. @Pica Missiles? As in explosive? Sounds great, but I've no idea how to A) make it explode on impact accurately. B) miniaturize that. Happy to assume that might be possible in the OP's world though.
May 9 at 12:29 comment added Escaped dental patient. @GoingDurden Nice idea, makes them more deadly in fewer number.
May 9 at 12:25 comment added controlgroup I agree with the answer in concept; a 3mm hole would indeed be "not that bad" as I've found some other stacks talking about this (space.stackexchange.com/questions/55993/…).
May 9 at 8:14 comment added Pica Very good answer.. i had upgraded those flechettes to knife-missiles and also mentioned that the foam is not structural. So if you fire a circle of these things into a wall, you still get a trap door to blow-out space.
May 9 at 7:08 comment added Going Durden If the dart can deliver sealant foam, then it is already extremely deadly to humans. If it can be designed that the dart punches through armor, into a person, and releases the foam inside their body....that for one turns a tiny wound into an expanding tumor of foam, but also gluts their arteries with expanding glue, which, if it reaches the heart, the brain, or just a major artery, pretty much ends the person. One extra option is to make the foam glue extra reactive, so that it could bond with just about any material from plastic to teflon... and thus human tissues as well.
May 9 at 5:22 history edited Escaped dental patient. CC BY-SA 4.0
Slight addition.
May 9 at 5:17 history answered Escaped dental patient. CC BY-SA 4.0