Today's Neatsfoot Oil isn't the same stuff our grandfathers used. Products labeled "Neatsfoot Compound" shouldn't be used because it contains petroleum products, which is harsh on the leather and over time will deteriorate the stitching. Product's labeled "Pure Neatsfoot Oil" aren't always "pure", but may also contain petroleum products so it's important to read the label and perhaps call the manufacturer. Unless their formulation has changed, Farnham's neatsfoot oil doesn't contain petroleum products. However, my preference is a product called Bick's #7. You'll probably only find it locally through a saddle and tack dealer, but it works wonders. Whichever product you use, do not use it to soak the leather.