Review on High Temperature HVAC Aluminum Foil Tape - 2 Inch By 210 Feet (70 Yards) 3.6 Mil - Ideal For Sealing & Patching Hot/Cold Air Ducts, Metal Repair, And More - Professional Grade Quality! by Carlito Tardy

This is great for sealing areas that have openings, due to not closing properly, or covering wood seams while waiting for sheet rock insulation. Have also used it on ductwork, but the ducts are so damaged, the tape was like putting a band aid on a large wound! The way to get off the backing, which is super difficult, is to make a slice with a box cutter, then open from that area. Works like a charm (thanks, internet). Would buy again.