What are common causes of roller laps or brush marks?

• A. Too little product
• B. Using the correct tool with light film
• C. Inadequate tool choice, too heavy a film, uneven brushing, or overworking the paint.
• D. Improper drying time only

Answer: (C)

The main idea is that roller laps and brush marks come from how you apply the paint—the tool, the amount laid down, and your brushing technique. If you pick the wrong tool or apply a film that's too heavy, you’ll get ridges or overlapping lines. Uneven brushing leaves streaks as some areas get more pigment than others. And if you overwork the paint, you’ll lift and rearrange the film, which creates visible brush lines and an uneven surface. Put together, these factors directly produce laps and brush marks, so the best answer lists inadequate tool choice, too heavy a film, uneven brushing, or overworking the paint.

The other scenarios don’t fit the common causes as well. Too little product tends to leave thin spots rather than pronounced laps or brush marks. Using the correct tool with a light film would help prevent marks, not cause them. Relying on drying time alone affects cure or surface feel more than the actual appearance of laps or brush marks.