However, Bing saved me a lot of time since I found this posting written by Jonathan Almquist, all about how to seal a MP. Since his posting is very detailed I have decided not to write my own posting about how to seal a MP but refer to his posting instead.
So here it is:
However, for sealing MPs a tool is required in order to create a key. For creating this key a tool named sn.exe is required. You can download the SDK containing this tool or you can download it from my SkyDrive directly. Saves you a lot of time .