For easy application around windows, doors, and decks, Nichigo G-Tape’s 3040BK acrylic flashing tape tears from the roll without sticking to itself. The tape can be repositioned in the first 30 to 40 minutes and fully adheres after a few hours. When tested for 50-year aging, the flashing retained more than 60% of original adhesion and 100% of tensile strength, according to the maker. Rolls are 65 feet long and are available in 2-, 4-, 6-, 9-, and 12-inch widths, costing $18 to $89, by size.