Brush Settings When Stroking Path

[Ofnuts]

The paint brush (the "classic" one, the MyPaint one may be different) is just hammering the brush at "spacing" intervals, it doesn't try to fill the gaps. To alleviate this, a possible solution:

• Add fading edges to the brush (top)
  
• Stroke the path, with a brush spacing around 80% to have some overlap (middle). The joins are lighter because they aren't fully opaque
  
• Add a layer mask, initialize by transferring the alpha channel, and boost the whites (map 0-128 to 0-255 in Levels for instance) to make the gaps fully opaque (bottom).