Rob

If you look closely at my installation photo you will see that I have put a thin metal u shape under the rear of the engine at the end of the engine to fill the gap between the pipe and engine. I used a piece of thin scrap titanium, stainless as used for the exhaust would do just as well. The reason for doing this if for any reason lighted fuel drips from the engine at startup it will not burn on the epoxy. I did badly damage a model like this once. In theory it should not be needed but I feel more comfortable knowing it is there. The counter to this is that if drips do fall below it they may be difficult to reach with the extinguisher. I have not found it necessary to paint the fuselage all around the point of the gap.

John