Flat brushes are among the most versatile shapes in a painter's toolkit. The straight, even edge of a flat delivers clean, sharp strokes and precise coverage, making it well suited to blocking in large areas, creating hard edges and applying paint in controlled, directional marks. Wash and spalter formats extend that coverage capacity to broader surfaces, practical for laying in backgrounds, applying grounds and varnishing. Square brushes offer a similar flat profile with a more compact format, useful for detail work and shorter strokes. The selection at DeSerres covers synthetic, hog hair and natural fibre options across all flat formats, suited to acrylic, oil and watercolour work at every level. For the full brush and painting tool selection, visit Paintbrushes and Brushes and Painting Tools.