Someone on this board recommended
this 3M shower tread about 5 years ago. I purchased it and have used it on my rulers, and also to make a seam guide on the bed of my sewing machines when I don't have a reliable 1/4" foot. Recently I had a bunch of 4.5" finished HST's to trim, and I was congratulating myself that I had just the right size BlocLoc ruler for the job. Then I looked more carefully, and what I was using was just a smooth ruler to which I had previously applied the 3M tape! I've used so much of it, I've even bought a second roll. And none of it has gone in a shower. If 3M knew about this, they would be marketing it to quilters, at twice the price.