To paint narrow lines, thin your paint and use a liner brush, applying very little pressure.
Here's a breakdown of the techniques based on the provided reference:
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Thin the paint: Dilute your acrylic paint with a bit of water. This allows the paint to flow more easily from the brush, creating finer lines.
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Use a liner brush: Liner brushes are specifically designed for detail work and creating thin lines. They have long, thin bristles that hold a small amount of paint.
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Apply minimal pressure: When painting, barely touch the brush to the surface. Applying too much pressure will splay the bristles and result in a thicker line. You want to skim the surface, not press into it.
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Control paint flow: Be aware of how much paint is on your brush. If your line starts thick and then gets thinner, that can be controlled by offloading some paint before starting and also by controlling the pressure as the paint runs out.
