If you have a better title for this thread please say it here, haha.

I've noticed that, with some types of canvases, the color gets a little bit duller when using a custom brush, compared to using the oil brush. I thought that was a bug, but it seems it is only the way AR works. With the custom brush you only get color information, without bump, so all the canvas texture gets in front of the color. But with the oil brush you also get bump information, making the thickness of the paint lay on top of the canvas texture as it builds. From distance this makes it looks like as if the oil brush has a more intense color.
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These images show it a little better.

Just wanted to share this. Maybe someone was noticing the same stuff and thought it was a bug. Also I think this is good to know because maybe it could be better to turn the canvas texture off when working with custom brushes. Depends on your work...