Pour the paint into a tray, or draw it with a tube nozzle if you use a tool with a built-in container. Dip the device into the paint (not very deep) and then peel off the excess on the can edge. Place the tool to the unpainted surface with the side on which the protective shield is attached (depending on a picked product). Take your time; the paint should be applied in smooth strokes along the baseboard or window line. If necessary, you can apply a second layer.