3m6851 is a 5 gallon water-based, sprayable masking liquid protects surfaces against automotive paint and primer overspray while protecting wet paint from dirt and dust. Overspray Masking Liquid-Dry be applied with conventional spray equiptment. Overspray Masking Liquid-Dry is designed to prevent gentle paint overspray mist from getting on the vehicle. It is not designed to take a direct hit of paint