Finding Mercury was easier than I thought. First I slewed to the sun with my solar filter and reset the compustar computer coodinates to match the actual sun values. Then slewed to Mercury coordinates and removed the cover and easily noticed the tiny globe with my 55mm low power eyepiece. I started imaging at prime but the disk was so small I went with my lowest barlow mag. While I don't do much daytime observing, I noticed that the mirror was "cold" relative to the ambient air, completely opposite of the night time conditions. Even after 2hrs of forced air to the back of the mirror, it was still cold and I had no choice but to keep the fans on during imaging full blast to keep the warm boundary layer minimized. It appears that I should have been pulling the warm air out of the OTA vs forcing in cold air. This would be opposite of the night time configuration. Not sure if anyone else has observed this issue and reverses the fan direction in day time imaging.