Thick textured water based Setasilk guttas can be used for outlining Setasilk paintings. They are applied directly with a tube or an applicator bottle. They pass perfectly through the fiber of the fabric and stop Setasilk colors, which can be then applied. Once fixed with an iron, water based guttas resist washing except for the clear gutta, which is especially formulated to be removable by washing. They can be used on all types of silk. Air dry in 30 minutes; fix with hot iron on reverse side of painting for 3-4 minutes.