What are this lines and how to clean it

Support Materials and Textures
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#1

When im painting im getting some gray lines on the paint.

lines on faces.blend (3.7 MB)

LINES%201
LINES 1.jpeg847×591 84.3 KB

When i fill the color i dont get any lines

But when i paint with color with the brush i get those lines.

How to clean those gray color lines. Any suggestion. Thanks

#2

Maybe this can help

#3

Pack your textures before sharing your file, I don’t have any image file and here difficult to help