Shading Methods (part 1) - SAI Paint Tool- how to install paint tool sai ,Method 1: Cell Shading. First, well look at cell shading. This is my usual method, because if s fast and relatively easy, especially if you have some idea how shadows work. We'll be using a mask for the shading layer here (as well as the other two methods). For my …Transfer SAI to a new computer? - Download Paint Tool …28-06-2014·If you DONT have the original registration email from Systemax, there is no way I know of to install again without buying it again. Each license file (.slc) is keyed directly to your machine identification code, so it won't work in another machine.