After the stitching my fabric looked like this, top:
Cover your work space with plastic or old newspaper because now is the time to add the paint. I used Lumiere halo gold blue, one of my favorites, and a foam brush.
Apply the paint till the whole top is covered.
Let the paint dry. Next step is to remove the stitched lines. Iron the fabric from the back and this is the result:
As you see the lines are outlined sharp and irregular.