>
    > Paul Lamar wrote:
    >
    >> I have seen a rotary engine that had ceramic coating on the
    >> rotors. The ceramic came off and destroyed the rotor housings wear
    >> surface.
    >> The rotors are low coef. of expansion iron no less.
    >> Dave Leonard has the engine. Dave can you please take some pictures
    >> of the rotor and the housing in question before you leave?
    >
    >


Partly true.  I had the ceramic coating on my rotor faces that Atkins
puts on.  After only a few hours of run time the ceramic was starting to
come off.  However, I cannot say that it damaged the rotor housing, as I
used those housings in my next rebuild.  Paul, you may have been
thinking of another damaged housing I showed you.

I do use coatings on the outside of my exhaust components.  While it
does reduce the heat transmission somewhat, I do it primarily to
minimize oxidation.

Before I put on the coatings, I used to burn through the high-temp
thermal wrap on my exhaust pipe and the exhaust pipe and turbo housing
were oxidizing away at an alarming rate.  Now, with the coating, the
thermal wrap stays intact and I use less of it, and there is no rusting
of the components.