There are a few different ways that you can paint a panel door, depending on the look that you’re going for. If you want a traditional look, you can use a brush to paint the door panels with a solid colour of your choice. Or, if you want something a little more modern, you can use a roller to apply a painting technique called ‘colour washing.’ When painting a panel door, it’s important to know what type of paint finish you want. A glossy finish will highlight the door’s panels, while a flat or semi-gloss finish will downplay them. You’ll also need to decide whether you want to paint the door in one solid color or in multiple colors. For best results, start by painting the outer edges of the door panels first. Once you have finished painting around all of the panels, move on to painting the rails and stiles. To avoid brush strokes.