Use a 2-inch angled sash brush. Start from one end and work your way across, always brushing back into the wet paint you just applied to prevent visible seams.
Painting window sills requires careful preparation and the right choice of durable, moisture-resistant paint to withstand daily wear and environmental exposure. For a professional, smooth finish without brush marks, many experts recommend using a combination of a high-quality brush for edges and a mini foam roller for the larger flat surfaces. Essential Preparation Steps painting window sills