Faber-Castell Gelatos can be used on any porous surface. They are great for adding color and sheen to paper, canvas, chipboard, wood, fabric, ribbon journal boards and many other surfaces. When working on fabrics, the piece should be considered a work of art and protected. It should not in other words be applied to a garment and then laundered. 

They should not be expected to be permanent when applied to a non-porous surface.