Welcome to TVPaint Community forums !

In the CustomBrush panel, can the custombrush bin be saved ?
So that I can have different bin's for different projects ?

I know that I can save (export) the brushes individually, but I haven't found a 'save' option for the bin as a whole...

I second that motion!

Oh, I should have put this in "feature requests" then, is suppose...
(so at this moment it's not possible, I assume?)

You are right, it's not possible at the moment. Sorry.