perfect for sealing rear diff filldrain plugs this is a must for sealing all threads dont use this youll be sorry a truly amazing product does a darn good job bought to install the motor but they included a tube great gasket maker great deal follow directions automotive must have long dry time and should buy permatex primer also thread sealant thread sealant seals fluid drain plugs perfectly on cars and motorcycles great product i like it better than teflon permatex sealer i cant imagine ever needing to buy more of this five stars but the silicone did not come out of the attached tip easily i instead took the tip off and just id be happy with the product if every tube ive ever bought love it building motors cant ever have enough of it