Painter 2015: Difficult to add more liquid metal to areas where liquid metal was erased

Description of problem:

1. Open painter and create a new document
2. Add a layer and fill with a dark color
3. Layers > Dynamic Plugins > Liquid metal
4. Paint liquid metal on the image
5. Click Eraser in the Liquid Metal dialog
6. Erase portions of the liquid metal on the image
7. Select Brush tool in the Liquid Metal dialog
8. Paint on the area where portions of liquid metal were erased

Result:

Liquid metal does not easily fill areas where liquid metal was previously erased.

Solution:

User must just keep painting until the area is filled.