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When the Cooling System has a small leak, often "stop leak" will fix it. However, large leaks such as caused by rocks will not. Stop-leak can gum up the cooling system if not used as directed. It can even fix leaks along the edge of a Head Gasket, as long as those are involved with cylinder combustion (blown head gasket). To nurse an old Radiator along, use a 7 psi cap instead of a 14 psi cap. Less pressure in the cooling system makes it easy on leaks. It can even stop leaks in Welch Plug (aka welsh plug) depending on the cause.
Counterpoint: Unless it's an emergency keep well away from it and similar products...it clogs the water galleries and radiator and will only make matters worse...
Australia
Repco, Supercheap, etc. all carry these.
- Chemiweld
- Irontite
USA
Just about any autoparts store has these.
- Silver Solder
- Bars Leak
- a zillion more...
http://www.partsamerica.com/ProductList.aspx?CategoryCode=3286