PLUG N DIKE™ is a nontoxic, nonflammable blend of high absorbtion polymers in a blended bentonite base that forms an immediate seal. It has been used for over 15 years by fire departments, transportation companies and industrial operations. PLUG N DIKE™ is extremely easy to use. It comes premixed, so just take it out of the container and apply it to the leak. Apply enough to get a good thick layer over the leak. It will seal it off temporarily, so you can get to a place to empty the tank.