GermanGTSDriver wrote:
In Germany there is (or was) a paste to blacken the cooking plates of old electric stoves and stovepipes. The stuff was available from various brands and was known as "Ofenwichse", 'Ofenschwärze' or "Herdschwarz". The best-known brand was "Elektro Puzzi", unfortunately no longer on the market. But you can still buy these products online and in the one or other DIY store. The stuff can easily be applied to a mounted exhaust with an old cloth (use gloves), but the rust should be removed first. After application, it burns in accordingly. I have no idea if you can get something like this and what it is called in English.
"Stove Blacking" is the English term - but haven't heard that in a long while! Still available in hardware stores both in the US and the UK.
However, it doesn't do much except make the exhaust look better - a decent "one coat" VHT paint is required, as used on BBQs etc. You need one that'll cope with 650°C (~1200°F) as the catalytic converter inside the exhaust gets Very Very Hot. I always used Rustoleum in the UK, where is pretty mandatory to re-coat the exhaust every year to keep it going as long as possible. Bloody salted roads.
No salt on the roads in California, and neither the 2005 LX or the 2010 GTS show any signs of rust at all!