Term: roller marks / stipple

Roller Marks / Stipple refer to the textured patterns or surface imperfections left behind after applying paint with a roller. While sometimes intentional for aesthetic or functional purposes, they can also be considered defects if not uniform or desired.

Definitions:

• Roller Marks: Visible lines, streaks, or uneven patches left by the edges of a paint roller. These often occur when the roller is overloaded, underloaded, or when inconsistent pressure is applied during painting. They can also result from poor technique or using low-quality rollers.

• Stipple: The textured finish created by the nap of a roller as it deposits paint onto a surface. A certain level of stipple is normal and expected with roller application, but excessive or uneven stipple can be undesirable. The degree of stipple depends on the roller nap length, paint viscosity, and application technique.

Causes:

• Using the wrong roller nap for the surface.
• Inconsistent rolling technique (e.g., stopping and starting mid-wall).
• Applying too much or too little pressure.
• Allowing paint to dry too quickly (especially in hot or windy conditions).
• Poor quality or worn-out rollers.

Prevention:

• Use the correct roller nap for the surface (e.g., short nap for smooth walls, longer nap for textured surfaces).
• Maintain a wet edge and roll in consistent, overlapping strokes.
• Use high-quality rollers and paints.
• Avoid overworking the paint once applied.

In professional painting, especially in Australia where high standards are expected in residential and commercial finishes, controlling roller marks and stipple is essential for achieving a smooth, uniform appearance.