???? Mixed up? Hate to burst your bubble my friend, but Ceramique is a single compound. If you had to mix it, either:
A) your friend and yourself got ripped off or...
B) you and your friend cant read
Either way, you didnt apply Arctic Silver Ceramique to your CPU. If there was mixing involved, you got a thermal adhesive, which is very bad news for your CPU.
EDIT: And your heatsink. Had you not separated them, there still might be a chance. At this point, your best option is to research 'CPU Lapping'. For safest results, I suggest reading http://www.tomshardware.com/forum/ [...] ing-guides
Be certain to read my post, the guide has been changed since I used it. Also, there are several sources online that contradict some of the info in the original post. Take time to google and research the work required before you undertake lapping your setup.