Bill H. wrote: My goal is two fold.  I would like to get as much of the
heat as possible out of the engine compartment, and two, I like the look
of the ceramic coating. Is it possible to accomplish this?????

Bill, my opinion is yes.  I would coat both the inside and outside.  I
did.  I can't find the source I used, if you want I'll look some more.
Craig Berland