This glue should be applied to the metal, then insert the leather into the clasp. If you put the glue onto the leather first then it will absorb into the leather and the bond will not be secured. One drop bonds approximately one square inch of leather, rubber, metal, glass, ceramics, porcelain and plastic. Use 1-3 drops per clasp, depending on the size of the clasp.
"Super New Glue" will bond to anything, including your skin. Wash any exposed areas with warm soapy water.