Brush and roller marks are marks from paint brushes and rollers that appear on the paint coating after it dries.
Poor painting techniques can lead to the appearance of marks on the paint. Painting over contaminants and on hot surfaces can also lead to brush and roller marks.
Cause 1:
Insufficient coating
If an inadequate mil thickness of paint is applied, the surface will be visible through the paint coating. Brush and roller marks will be visible as well.
Cause 2:
Uneven thickness
If the brush or roller doesn’t have an adequate amount of paint, it will leave a track on the surface. The tracked areas will be thicker than the rest of the paint coating.
Cause 3:
Incorrect roller nap
If the incorrect roller nap is used, too much or too little paint will be applied. If the nap is too small, the coating will be too thin. If the nap is too large, the coating will be too thick.
Cause 4:
Dusty or dirty surface
Dust or dirt on the surface will capture paint as it comes off the roller. The paint-coated dust and dirt will appear as ridging—small bumps on the paint coating.
Cause 5:
Hot surface
It’s important to maintain a wet edge while painting, working from wet to dry. Painting in hot temperatures or direct sunlight may cause the paint to dry almost immediately after it’s applied, losing its wet edge. As succeeding rolls of paint are applied, they’ll fail to blend with the dry edges, giving the separate rolls of paint coating a lapped appearance.
Cause 6:
Poor retouching
If a roller is applied to a coat of paint for retouching before the paint dries, the roller may lift the wet paint from the surface. The paint coating will have an uneven, mottled appearance, because it will be too thin in some areas.
