[echoangle]

Some problems i can see with that:

It might be hard to access the actual pressure hull from the inside (there's probably insulation and padding on top)

If you use paint, you somehow have to get rid of the solvent in it when it dries, which might be a problem when painting a whole module

[Lalabadie]

Air filtration is one of the hardest things do deal with in space.

I don't know what solvents would do, but I remember that astronauts' bone density loss in space means there are challenges around managing the significant amount of calcium captured by the air scrubbers in the ISS.

[kakacik]

Do they literally sweat their bones away? I can imagine how it would work on molecular level via sweat / breathing, but I would expect >99% to be simply pissed and shat away.

[Lalabadie]

Edit: My bad, with calcium it's the liquid filters that deal with it, not the air scrubbers.

Quoting an ISS astronaut: Today's coffee is tomorrow's coffee.

[PaulHoule]

Wouldn't the calcium go out in your urine?

[schiffern]

Yes. It was the urine processor that had problems with excess calcium, not the air scrubber.

https://ttu-ir.tdl.org/server/api/core/bitstreams/f8ca865b-1...

[Lalabadie]

Appreciate the correction!