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"Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way."
- Robert Heinlein

Sprayrock  
  Special compound that can be sprayed onto a surface, that hardens into rock.  

It's kind of like sprayable concrete, useful for building things in a vacuum.

Three of them ... were laying down sprayrock... The false gravity assisted the sprayrock application, bedding down the layers of the binary compound before they fused.

His hand moved to shut the trigger of the sprayrock gun...

From Pushing Ice, by Alastair Reynolds.
Published by Gollancz in 2005
Additional resources -

Compare this item to the technology used in the real-life Contour Crafting 3D House Printer.

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Additional resources:
  More Ideas and Technology from Pushing Ice
  More Ideas and Technology by Alastair Reynolds
  Tech news articles related to Pushing Ice
  Tech news articles related to works by Alastair Reynolds

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