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On 10 Dec 2004 at 11:24, Gamboa, Gary wrote: > >then you can sandblast them and POR20 them > > POR-20? Do they get that hot? POR-20 is supposed to be good to 1400F, which is astonishing. The data sheet for POR-15 indicates that it will work up to 600F, which is pretty surprising to me, but should be more than enough for the outer sheet steel of the HEs. 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~