Shurtape Duck Tape® Exterior Masking Tape is an exterior (and interior) masking tape that is a very thin and supple, PE tape. It is UV-resistant with a PE- laminated backing and is easy to tear in a straight line making it ideal for corners and hard to reach applications. The tape is waterproof and can be applied up to 3 weeks (outside or inside) prior to painting (for best results remove immediately after painting). Use with all types of paints and varnishes. Can be used for precise edges when applying plaster or castings.