isnt all duct tqape the same -
No there are cheap crappy ones and good stuff. Here at we have Princess Auto. They have a huge selection of cheap stuff. My buddy bought Duct tape from them thinking it is all the same stuff. It was okay depending on what you use it for. It let light penetrate so I had to stop using it to seal some gaps in my black and white plastic as it was not good. Very thin, very low quality.
If you want to be safe buy the one made by 3M (Scotch). They always make a good product. they have different levels like I said I just bought the extreme. Extra money but not really needed it was overkill. It was just made to handle moisture, cold and heat better. The regular stuff is more than okay, no need to spend the extra money. Just go to lowes, home depot or wal mart. They all carry the 3M/Scotch brand.
Do not get the silver foil one. Although that is good, it is good for duct work (which if your vents at home are not sealed it is a good idea). You want to get the one that is made with rubber. For what we use it for it is the best.