Thanks for the tips guys, I will be using the original formula - why mess with something like that I might set up a shelf or something or indeed a spare cupboard with some string to hang some up, I will probably go with a few sheets to start with, I don't want to make too much of it up as I don't want to waste it after spending the cash on the chemicals.

How much is normal for each sheet btw? I have seen just a few drips does a sheet which looks rather economical as it just needs to be an fairly thin even coating, its also good that you can do it under normal bulbs so you can actually see what you are doing