Have seen Bristol radial engine exhaust rings, painted in a Tamiya colour called "Burnt metal". It looks really good, looking like typical blued exhaust metal. My local hobby shop stocks quite a good selection of Tamiya paints, but it seems not this one. Anyone able to give me the Tamiya paint number?

On my motorcycle kits I use gold, silver, transparent blue in various mixtures to get the colours I'm after on the exhausts, but could include some of their other metallic colours like copper to get the effect I'm after. Hope this helps.

I have a mate that does a lot of jet aircraft. He is particularly fond of "Century Series" jets and any other jet that wears a NMF. He does some amazing heat staining and burnt effects using metallic colored eye shadow. Seriously! He goes to a make-up section, picks out various blues, silvers. oranges, reds, and smoke colors then mixes and blends them to achieve some extremely realistic effects. He also seals over them without any adverse effects. He also purchases the cheaply made eye shadow makeup as he states they cheaper ones adhere and blend a lot better than their more expensive counterparts. Note, I have not tried this myself so I cannot comment on the relative ease/difficulty of application or blending, but from what I have seen from the results, it may well be worth giving it a crack.

Just a note about these and other 'specialist' pastels. The model must be stored in a dry place afterwards. General humidity affects the powders in the long term. I stored a couple of models in my garage, in boxes that were tape-sealed and bagged, and a few months later I decided to take them to a show for display. When removed from the boxes, the fine powders had clumped in dark smudges, that looked more like MIG oil-based weathering grime.

Oops!

Graham gets the credit for this one - see Hyperscale discussion forum 11 Feb 2014 WNW Re-8 build work-in-progress

An effective burnt metal look for exhaust pipes is achieved by spraying a coat of Humbrol Bronze and then shading the item with powered graphite - See Graham's WNW Re-8 exhaust pipes - looks pretty effective to me - gets that burnt look without the heavy rusting you sometimes also see