I've used a few different brands of foil tape and this stuff is the best I've found. It is nice and strong while being pliable enough to get into tight spaces and around corners. I'll continue to order this on ebay rather than take a risk and get something of lesser quality at the hardware store.
High Tensile Strength Duct Tape Silver, 5.8mils, 2 Inches x 50 Yards - All-Weather Duct Repair Tape for Commercial Use, Heavy-Duty Repair, Packing with Temperature and Shear Stress Resistance - XFasten
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