As I work, I find that the difference between using slurry and water is based more on what I am working with. When I start out, I often use water and that eventually becomes more murky slurry. However, when I am throwing larger, I find that slip does not work as well for me. It is the way the slurry holds the moisture against the pot, slowing drying and letting water absorb into the clay. When throwing larger I have a tendency to throw very dry, and slurry does not seem to work. I also do not like it as much when throwing bowls as the form has to have a max amount of stretch, and max support for the cantilever sides. When throwing cups, mugs, chalice parts, lids, neck rings or foot rings it really doesn't matter.
Hope this helps you,
- Rae Reich likes this