If you are making piping or cording and hate that sometimes the basting you use on the piping sometimes shows in the finished garment.... I have a solution for you. Plus you can do this without your sewing machine! If you have a rolling leather foot for your machine or a piping foot that accepts larger piping, this may not be as big a problem for you.
Cut your piping cover as usual (bias, normally). Then put down stitch witchery or steam a seam down on the fabric wrong side along one long raw edge of the bias strip. Lay your filler in the middle and fold the raw edges over to match to the other raw edges. Iron the fabric so that the glue melts and secures the fabric together around the filler. This way you never have to worry about any basting stitches showing. Plus you can do it in front of the TV away from the sewing room! (Or in a hotel!)
Another choice would be to use fabric glue (the permanent kind). If you glue with a temporary glue it might be ok if you are doing what I call immediate and unprepared sewing (I do a lot of that when genius strikes or family requests!) You can get a Bernina "leather" foot (also commercial feet) that has a roller bar that pushes the piping away from the needle, but I begrudge spending time a)sewing the piping and then having to resew to the item and b) worrying about hiding the piping stitches in the item. (Now can we all say together, "JANIE IS VERY LAZY"?)
This also works nicely when using "barely there" filler, like fine yarn or string. I had problems "sewing into" the finer filler when speeding along the length (I know I should pay more attention but I get caught up in a zillion stitches per minute when I am making trim!)