The Milwaukee Hand Tools INKZALL™ Liquid Paint Marker with xylene-free paint and a durable acrylic nib for the most demanding environmental conditions, working surface temperature from -10° up to +145°. Metal outer barrel for construction site durability. The paint dries within 10 seconds, and the water and UV resistant markings last for up to 6 months. It marks on dark surfaces where traditional markers would not be easily visible and can be used on rough, dirty and greasy surfaces. For use on concrete, black pipe, aluminium, PVC, steel and stainless steel, rubber and tyres. IMPORTANT: Shake the marker with the cap on. Remove the cap and carefully pump it up and down until ink flows into the nib.