And it is simple to use,just brush or sponge it on the surface to be painted and the cracks just appear.The thicker the application of paint the smaller the cracks.For the barnsiding look use Silverwood stain as an undercoat.Individual flakes can be picked off using an xacto knife,tape or gentle knife scrapping .The jury is still out in regard to using this technique on plastic but I will keep you guys informed after further experimentation.