This is molyslip copaslip - a copper-based anti-seize compound.
what it’s used for:
stopping bolts, threads, and metal parts from seizing, rusting, or galling together. it’s basically “lubricant for when you don’t want things to weld themselves shut.”
key details from the tin:
1. type: high-temperature, anti-seize compound
2. temp range: -40°c up to +1100°c - that’s extreme heat resistance
3. size: 500g tin, copper-colored paste
4. brand: molyslip - uk brand, well known in automotive/industrial work