Fill the line, not the panel.
A scratch is a chip with length. The mistake is treating it like a panel: brushing paint along it, flooding both sides, then trying to blend a stripe that was never supposed to exist.
The method does not change. Clean, a very small amount of paint exactly in the line, level with Monkey Milk, dry. What changes is the applicator and the direction of your hand.
Follow the line with the towel, not across it. Debris hides in the groove.
A fine Monkey Tip rides in the scratch like a pen in a groove. Move slowly and let the paint wick along the scratch. Paint that lands outside the line is work you will be removing in a minute.
Once it is dry to the touch, fold the Monkey Fiber Cloth, a few drops of Monkey Milk, and wipe in the direction of the scratch. The excess lifts, the line stays filled.
Deeper scratches can take a second pass once the first is dry to the touch. Shallow ones that only cleared the clear coat are a different job and a different training.
If the scratch did not go through the color, paint is the wrong answer. Touch-up fills where color is missing. A clear-coat scuff wants correction, not fill, and filling it makes it worse.
Sold to working automotive professionals for practice and service work. Not a consumer product.