Anvil #245 Blue Liquid Masking is formulated for use when painting and masking windows/doors and glass. It forms a tough, flexible protective coating that can be easily removed from glass after a few hours or stays flexible, pliable and strippable for up to 30 days. It is a primer for ready to paint wood as it is applied to the total surface of windows or doors. It adheres to wood and removes easily from glass, fiber-glass gel coats and glazed tile.