I used this stuff once to fix a feathering boat propellor back in the early 90's in mid-atlantic. We destroyed the internal gearing. It did everything they said it would. We used that prop for a long time after. Carry it frequently now since that time especially on offshore work.
IIRC they said on the advertising that every American tank in the gulf war carried a kit for emergency repairs. I remember being amazed at how heavy the products were.