I've just bought a Tetenal 3 bath kit with the intention of processing a batch of Super 8 (Kodak Ektachrome 100D) and have a couple of questions...

- I have the 5litre capacity. In terms of longevity (if processing low volume) is it best for me to mix the lot and use from there or should I part mix as I need it?
- I read something about a Tetenal Spray for preserving??? What is that? How important for longevity?