by 
The Curious Bag
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<h4 class="dechead">On One Hand: AlumaSeal a Quick Fix
AlumaSeal, which comes in liquid and powder form, can be used to plug pinhole radiator leaks. Sometimes it also works on larger holes. The manufacturer says it's safe for all radiators, heater cores and coolant system parts. While generally a short-term fix, some mechanics say AlumaSeal can permanently sealed small leaks in coolant system.
On the Other: It's Not Guaranteed
Some mechanics say it's risky to use AlumaSeal, particularly in smaller core radiators. The product has been known to clog heater core hoses, so a mechanic will recommend running the heater as soon as you use AlumaSeal.
Bottom Line
If you have a small leak, the consensus among mechanics is that you should give AlumaSeal a try, particularly if the car is older and you're not inclined to spend a lot of money on repairs. For larger coolant leaks, or leaks in a newer vehicle, it's best to get the radiator repaired or replaced.
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