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Maybe you are already using this type of tape and know just how wonderful it is, but if not let me tell you about it because it is something that will make your sewing life easier.
I first picked up a roll of this tape to try when sewing an invisible zipper. Invisible zippers aren't something I have a lot of experience sewing, but using this tape made it super easy and my zipper turned out perfect. Now this tape is my go to thing when sewing zippers.
When using it for zippers, I use just a few small pieces--one at each end and one in the middle. The roll is 10-yards, but if you sew a lot of zippers you'll probably want to conserve the tape. If you are newer to sewing, skip conservation and tape the whole length of the zipper to really hold it on in place firmly.
It doesn't gum up your needle and though it does wash away, it also doesn't have to be removed. If you put it on next to the very edge of the zipper tape it will be hidden after you sew on the zipper.
The other place I use this tape regularly is for VELCRO. Before using this tape my VELCRO almost always ended up slightly off kilter no matter how hard I tried to keep it straight! So it's nice to not be looking at crooked VELCRO anymore.