I had a crack on the head of the 125 engine of my dirt bike, oil was leaking more and more. After applying a sealant over the end of that, I do not lose a drop of oil! So it is very resistant to heat and to the many shocks and vibrations. In addition it is very simple and easy to use, simply knead the dough with his hands to the heat, then apply, and wait an hour for it to dry and harden completely.