yes Im very sure it works im just not sure how to set it up with my system as I explained above. Did you look at the link?

it seems you cant use the labels in scrpits and configuration files. For example you cant do:

sudo fdisk -l LABEL=Home instead of sudo fdisk -l /dev/sdb5

it just says cant open device. So if your using device-mapper for encrypted partitions you cant use label in the files that refere to the partition being encrypted. Im no expert but I spent days trying to make this work with labels and it just wont accept it.

I finally found a way to make this work. Too recap the problem in short:

creating a bootable external usd hard disk with multiple distros.
Linux could name the usb drive /dev/sdb or /dev/sdf etc depending on what computer u plug in to or even at random for same computer or other usb devices are allready plugged in.
Could be solved with partition labeling, but does not work for for example encrypted partitions that use device-mapper (LUKS, dm-crypt), as I could not pass labels in scripts(crypttab etc)

soulution was to create a custom rule in /etc/udev/rules.d/ where you either change the name of the device from sdx to whatever you like or create a symlink. For more on writing udev rules check out:

http://www.reactivated.net/writing_udev_rules.html

Hope this helps someone else, cos this was driving me nuts for a long time.