Liquid Rescue never gums up or becomes sticky, it will penetrate through old sticky deposits and free them, and the application almost never has to be repeated! It just never goes away or gets “old”. Liquid Rescue, a fully-synthetic compound, is made using a process that re-arranges the structure so all the molecules are uniform in size, shape, and weight, an ideal phenomenon which does not occur in nature. Liquid Rescue is also essentially odorless, so your hands and clothes won't smell after using it. You will notice that your machine will immediately operate more easily and smoothly with Liquid Rescue. It is plastic-safe, and will not harm any painted surfaces. We always offer a money back guarantee if you aren't 100% delighted with Liquid Rescue. Liquid Rescue never becomes sticky or gummy, so after using it just once, your sewing machine will always come out of storage each time feeling silky smooth and ready to go at a moment's notice!