Woah, lots of questions...
-This technique is for polishing after it's already smooth and you think it can not get any smoother. Although, after using this technique properly, it will prove your initial assumption wrong.
You should use the metal kidney for initial smoothing prior to using the water technique though. It helps a lot.
-I do mean those metal kidneys.
-I actually bend my kidney into a “U” shape to help with the smoothing (Bend it like you would a hotdog bun). You get a better result that way as you don’t have to apply much pressure for this technique to work properly. The key is to never use an edge. ALWAYS use the rounded part of the “U”.
-I barely touch the clay when I do this. There should be a fairly large amount of water on the surface so the water does most of the work. The water will run and pool everywhere, but it will dry in no time. If you’re impatient, you can always take a paper towel and absorb the pools of water when you’re finished to help make the drying process faster.
-The angle depends on the angle of the surface. I just run it over the surface in any direction I feel like until I find an angle and direction that works best. Trial and error is always a friend. Just be careful with it, because one wrong move could send you back a few minutes with the sculpting tool again.
-Warm water will make the clay soft. You don’t want that for the final product because then the clay will move around too much. Use cold water for the finishing touches on the surface of the sculpt to smooth it out. But you can use warm water for the initial smoothing before you use cold water to help the clay move around a bit, fill in any small holes/imperfections and so on.
-A regular old spray bottle, yes. Just make sure it’s shooting out a nice, fine mist. Not a jet stream of water.
-I don’t have a video, sorry. Hopefully my advice is enough to help. You should be able to figure it out from there
And just a word of warning, the kidney tends to stick to the clay when you work it with the water sometimes. Make sure you have PLENTY of water (A fine mist that covers the area you are working) to avoid this. If it sticks, stop moving the kidney, pull it from the clay, spray some more water on the area that it was stuck to, and re-work that area.
Hopefully that answers everything. If you have any more questions, ask away. I’ll do my best to answer.
Good luck,
Jake
Xtreme TACTICS 101