It's called Roof and Gutter Instant Patch Tape. The package specifically mentions that it's from a company called Mortite; I'll explain why later.
First off, I don't know yet if it really works, but the initial indications are hopeful. It definitely sticks, even to the slipper
Here's why: it's called tape, but it's not quite what I expected. It's actually like semi-liquid rubber on a (sort of) non-stick backing tape. The backing tape is probably pretty non-stick, but the rubber stuff is so sticky it almost adheres to air.
It comes in a roll. As you unwind it, the bottom is exposed rubber and the top is the backing paper. The instructions say to stick it to the roof, like you would do with regular tape, then peel off the backing.
Mortite, officially the J.W. Mortell Co. of Kankakee, Illinois, invented rope calk and got a patent for it back in the 1940s. It got written up in Popular Science magazine. It's now part of a company called Thermwell Products. Thermwell started making felt weatherstripping in 1910 (as Thermwool) and introduced Frost King in the 1960s.
Weird fact about the company? President Obama called it's weatherstripping sexy.
(Quick tip: wear plastic gloves. I didn't, and earned the chance to experiment with some solvents. Goo Off worked pretty well).
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