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I agree they are over rated... But the Rustoleum spray on stuff will rust off astonishingly fast. Tried that some time ago Keith > OTOH, I just checked out Rustoleum's web site and they show a heat resistant > paint that is good up to 1200F. I'll bet that it's a LOT cheaper than POR-15 > and might even be locally available. It comes in 5 colors, including black, > white, and silver/grey. > > Overall, I'm pretty skeptical about some of these hi-temp claims. A lot depends > on how they define "resistance." Heating to some temp and then cooling back > down without visible color change is a lot different from holding it at that > temp, in air, for an extended period, and then expecting it to still protect > the surface the same as an unheated sample. > > For example, metals start to glow dull red at 1200F and I don't know any > organic compounds which will survive that. Zinc and cadmium vaporize only > slightly above that, but generally don't last that long, since they oxidize > first if this happens in air. > > -- > Jim Adney > jadney@vwtype3.org > Madison, WI 53711-3054 > USA > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >