Brilliant Painter Pens from Marabu really are brilliant! They have a glossy opaque finish with excellent adhesion to most surfaces - glass, metal, plastic, cardboard, paper, wood, terracotta and more - whether smooth, porous, transparent or dark. The pens are fast drying, light fast and weather proof when well applied. Weather proofing is further improved by allowing to dry for at least 30 minutes and applying a Marabu-aqua varnish. Brilliant Painter Pens are free from toulene/xylene, and are available in 3 tip sizes (0.8mm for fine detail, 1-2mm for writing and decorating, and 2-4mm for larger areas). Store in a horizontal position.