Need help filling shapes drawn with the brush tool.

Hello, i'm using Substance Painter 3D to draw a pattern onto a 3D model.

So far i've been drawing my shape outlines and filling the shape in manually, this is very time consuming and inefficient.

It seems there is no simple way to fill these shapes I have drawn. 

Is there a bucket tool option? Or some way to auto fill the shapes once I have closed them off?

Hope to hear from other users, thanks.