Really? o-o;; I've tried to use it as a method of shading before and it was still transparent.. hmm. I've been fiddling around with the settings more so let's see if I can get it working. <3 I usually either use the pen tool for base or brush tool.
Yeah if you want it to stand out more. :3 I know! The weirdest things usually happen to me using SAI. I think the program has it out for me..srsly. I still love it. D: The blending is just so much more fluid in SAI than in PS. Anyways I shall stop my ramble, this really does help. D: So thank you for posting this up. <3