Liquid paint marker for rough surfaces and extreme durability PRO-LINE XT® is a liquid paint marker engineered for the ultimate marking performance on rough, rusty, and dirty surfaces that utilizes an enamel resin to provide enhanced wear-, weather-, and chemical-resistance.  The fast-drying paint formula binds quickly to materials to leave a bold, highly-visible mark and is free of Xylene and other harmful chemicals to reduce user health risks. Engineered for continuous and highly-visible marking on rough, rusty, and dirty surfaces. Enamel paint for extreme durability and enhanced wear-, weather-, and chemical-resistance. Available in 14 bold, fast-drying colors for immediate handling and reduced downtime. Xylene-free paint reduces user health risks and eliminates California Proposition 65, EPS HAPS, and SARA 313 concerns in the U.S.A.. Durable metal barrel and clip-cap reduce breakage and store easily in pocket. Marking range: -50°F to 150°F (-46°C to 66°C) Steel mills and warehouses