I use rust-oleum impliment paint. I just "deglaze" the engine using Dawn power desolver. It helps to create a surface that the paint really adheres to well and the paint also seems to hold up to the heat very good. As far as I can tell it has little or no negative effect on cooling. I have checked the head temps several time, and it runs cool as a cucumber and actually I have no proof, but I think it may also help to dampen the engines harmonics and give it a more mellow sound. The stock Ryobi finish is not exactly "purty". Ford Blue is kinda my color, and kinda makes my engines reflect my taste and personalizes it. I will look forward to your photos.