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The youtuber NightHawkInLight made a video about a similar coating (he is using CaCO3 whereas this here is using Al2O3) https://www.youtube.com/watch?v=KDRnEm-B3AI

It was also discussed here https://news.ycombinator.com/item?id=36579995

Would be interesting to know how the performance compares.

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Tech Ingredients youtube channel made something similar: https://www.youtube.com/watch?v=dNs_kNilSjk

The top comment there is actually by NightHawkInLight, so they seem to be having a friendly competition/mutual inspiration in pushing this DIY technology forward :)

EDIT: curious to see if Tech Ingredients' barium sulfate or NightHawkInLight's calcium carbonate will work out better in the long run. The latter looks a lot easier to manufacture though.

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