I saw your post last night and was trying to find out some kind of answer. I'm not familiar with those paints. But the Easy Air dry Ebook I think you are referring to, April Yap was the instructor along with Lara. You may want to pm or email her she would know the measurements from using her Ebook. She also does a lot of air dry. I also have this Ebook so I went and checked she uses pipets which are capfuls. And she uses drops . I see that she doesn't use smidgen or brushfuls in her measurements.. I would find out from Cher about her measurements .But it sounds to me 1 drop would be pretty close to 1 smidge. I do know in measurements a smidgen is a tiny bit larger than a drop.