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I don't get it. You're spraying a surface with tiny particles of glass, right? So how would they form a cohesive layer, instead of sitting on top like loose sand, to be brushed off (or ground into the surface) by the first thing that touches them? Coating something in actual glass requires melting it and letting it harden into interlocking structures, right?

Sounds like snake oil to me.

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Nah. There are all sorts of ways to suspend glass microparticles and a binder in some kind of solvent that evaporates after spraying, leaving a glass-particle-and-binder layer behind. The physics/chemistry of it are pretty easy (for those so inclined). What's probably hard is making the deposited layer durable and non-toxic. For example, if the glass microparticles turn into aerosolized dust then you probably don't want to do a lot of breathing anywhere nearby; think asbestos and cigarettes.

I haven't read the article, but going from your description I'd guess the answer is electrostatic forces.

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