Before You Begin

Pros recommend using a 2-inch angled brush, often called a sash brush.

But any plastic bucket will work, provided it has straight sides.

Too much paint in the bucket makes it harder to avoid overloading the brush.

Paintbrush applying white paint to wall near wood window trim

The Spruce / Margot Cavin

Keep the sides of the bucket clear for wiping off excess paint from your brush.

Load the Brush With Paint

Dip the tip of the brush into the paint.

Drag the bristles against the inside edge of the bucket to remove excess paint.

Materials and tools to cut-in paint

The Spruce / Margot Cavin

The brush should be relatively dry since you’ll only be painting small areas at a time.

Place the bristles on the surface, forming a wedge shape with the bristles.

Use the sharp end of the wedge to start the paint line.

White paint poured into bucket

The Spruce / Margot Cavin

Draw the bristles along the line you want to paint.

As you begin moving the brush, let the bristles press into a fan shape.

The outermost bristles are drawing the line, not the entire bristle surface.

Dab paintbrush into paint bucket

The Spruce / Margot Cavin

Tip

Draw flat crescent shapes with the paint.

Create a long straight line by applying several flat crescents in a row.

This may be time to call in a professional painter.

Paint brush applying white paint alongside wood trim

The Spruce / Margot Cavin

Uneven and bumpy surfaces are particularly difficult for cutting in paint; even taping the surface might be difficult.

That’s another reason you may want to have a professional do the job.

Paint brush broadening white paint line

The Spruce / Margot Cavin

Dampened rag cleaning mistakes from wood trim

The Spruce / Margot Cavin