I used to put pins in the cut end of fabric that I used a few strips of every once in a while. This happens often with white, black or other neutrals that go with anything, of which I usually purchase yards and yards at one time. Now I set the machine stitch to "very long" and sew a few (just 2 or 3)stitches about 3 inches or more from the cut end. Lift the presser foot and pull the fabric ahead and make a few more stitches, and do that one more time. Be sure the fabric is flat between stitching. Then, when I want a few more pieces off that fabric, the end is still perfect. Saves a lot of time getting the end "cuttable" and saves fabric because you don't have to keep trimming the end each time. When it's time to take out the stitching, just pull those loose threads between the stitches. No pins to rust.