You might have wanted the 200G instead.... it has a small color cup. I use that one, and it's great.
That little notch on the SG, as far as I know, is the reservoir. The only thing I've been able to figure is that folks who use it for nails only needs a very small amount of their stuff in it.
So, yeah.... fill it up, turn it on, and paint. Then repeat. And repeat.
Hate it for you.... I almost ordered that one too.
It's a good airbrush, no doubt, but without a color cup, it seems to me it has limited use for modeling beyond very subtle and small detailing.
Jon Bius
AgapeModels.com- Modeling with a Higher purpose
"For I know the plans I have for you," declares the Lord, "plans to prosper you and not to harm you, plans to give you hope and a future." ~ Jeremiah 29:11