Bondloc B5120 Radiator Seal 50g

Heavy duty radiator stop leak works faster and stops larger leaks than liquid radiator repairs or the non–metallic powdered radiator repairs. Contains expensive copper particles plus hardening and sealing agents. Triple action seeks out any leaks, then seals them with pure copper

Properties
Pack Size : 50g
Colour : Copper

Applications:
With engine turned off and engine cool, remove radiator cap. Start engine and run to operating temperature. Be sure radiator is ALMOST full. While engine is running, slowly pour the contents into the radiator. Run engine at fast idle until leaks stop. (If leaks persist, mechanical repairs are probably needed). Replace radiator cap. Radiator Seal Compound mixes with water and antifreeze mixtures. Use one container for cooling system capacities up to 20.8 ltrs.

https://www.bearings-online.co.uk/uploads/tinymce/Bondloc B5120 Radiator Seal TDS.pdf