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Apparently powdercoat is heat resistant to 550c (random first google hit) if my fire gets that hot about a metre away then it probably means my house is on fire.
I did consider trying to paint it in stove paint, but given there will be about 30 75cm high bars I figured that would get very annoying very quickly.
Sam_w-
Apparently powdercoat is heat resistant to 550c
Only special high temp types. Ordinary commercial/decorative coating can start to fail at temperatures below 100°C.
For a fire-guard, I'd avoid any kind of polymer coating. A straightforward gun-smithing type of hot or cold bluing will provide a pleasing aesthetic and adequate corrosion resistance, and it won't evolve toxic smoke if it gets burnt.
gbj_tester
No idea to your question, but is there a risk of the heat damaging the PC?
If you are having it black I'd be tempted to ask if they can do a Japanned finish - although it might warp I guess.