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
found the error.... Sai is a windows exclusive program as of late. you have 2 options i can see: buy a windows desktop (rec for art) or use vmware and run windows on that. vm is virutal machine so it will be running on your mac while you run the mac os. kinda like a mini pc in a mac.