What is the difference between the Markal Valve Action Paint Marker and the Pro-Line HP?
The Pro-Line HP is faster drying and has excellent writing characteristics on oily, soapy, wet and difficult applications where the Markal Valve Action Paint Marker may not mark as effectively. Also, the Pro-Line HP does not contain Xylene, a chemical that is proscribed by many organizations due to harmful by-products and regulatory issues.