Engine block leak sealer HOLTS Wondarweld 500ML

Repairs leaks in the cylinder head and engine block. Repairs cracks and holes in the water jacket. Stops internal and external leaks. Suitable for steel, iron and aluminium parts. Helps prevent a major engine overhaul. Not suitable for use with antifreeze, coolants or many chemicals, which may cause the active ingredient to precipitate and block the system. Add the product only to clean water, never to oil, to prevent engine blockage.
Directions: 500 ml of additive for a 15 l cooling system.