File Vault (FV) acces to partitions with two OS on one machine

I am still on 10.6 but just ordered a new MBP, so I can not check myself at present.
For technical reasons I would like to have 3 partitions on the MBP, two of which will be a Mac OS 10.8 systems.  The HD has thus 3 partitions.  lets call them OS1 and OS2 and D3.
If I turn FV on for OS1 seperately in the control pannel of OS1 and OS2 again in the control pannel of OS2, will both be able to read D3?  I assume yes.  correct?
Now if I turn FV on for OS1 and D3 in the control pannel of OS1 FV.  I assume that when I boot from OS 2 I will not be able to access D3?  or?
If this is indeed the case, is there a way around it? Like would it work to have both the users on OS1 and OS2 be identical?  Or?
I look forward to your thoughts.
Message was edited by: ChangeAgent

Thanks.
Not sure I understand your answer, let me recap to see if I understood.
So any internal partition that is on the MBP will only mount if I tell it to, it will not mount automatically when the machine has started up?  At that point I enter the password for the disk. 

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