Merco M187 Blue Painters' Masking Tape is high performance masking tape for general industrial, construction and do-it-yourself use. The acrylic adhesive system will not dry out and lose holding power and the product will cleanly remove from most surfaces for up to 21 days. The M187 product works on drywall, glass, hardwood floors, wood trim, and a variety of other surfaces. The most typical use is paint and window masking.