I would like to know the part number of the 3M Blenderm tape? I have a two year old boxes with the part number 1531p-1, and I cannot find anything with this number. I see on the 3M site part number 1525-1, it look the same, but I remainder that they where two different type in the store. And one was easily ripped vertically and horizontal, and the tape same not clear, but semi-transparent? Thanks.