The Fineline Masking Fluid Pen is a durable and reusable dispensing applicatorfor Finelines proprietaryhypo-allergenicliquid latex masking fluid. The 18g Masking Fluid Penallows the user to precisely apply the masking fluid to a variety of surfaces. The unique cap wire closure system maintains an air-tight seal so that the masking fluid never dries out and is always ready to use.