I'm getting brush marks when I apply British Paints H2O Enamel. Why is this?
This is caused by overworking the paint on the surface, resulting in brush marks. To rectify this problem, after the surface has dried, lightly sand the area to an even surface to remove the brush marks, then apply another coat. To avoid brush marks load up your brush to 30-40% and reduce the area you brush out. This increases the film build, which allows the paint to stay wet for longer and gives it more time to settle to an even finish.