Mr.Masking Sol R contains a new formulation which can be readily applied, cut, and removed after use. This product has the same characteristics as the previous Mr.Masking Sol M131, which is no longer manufactured.?It is a water-soluble product, so when it thickens during usage, you can thin it out with tap water for extended use. Apply MASKING SOL where you need it evenly with a brush. After it dries within 20-30min, it becomes translucent film. Cut unnecessary parts away neatly with a design knife, etc. leaving masked parts, and then apply paint. When the paint has dried completely after painting, peel off MASKING SOL. MASKING SOL is water soluble, so wash out brushes with water.