I've also had good success with Bars Leak products. Used to use one that was a black liquid with semi-solid pellets, not sure they still offer that, but it was my favorite.
A couple things that need to happen for it to be successful though.
The leak needs to be low enough it is below the liquid level line. A leak in the top tank, above the coolant level will not seal.
And there needs to be some means of the system to build pressure and come up to operating temperature when the stop leak is put in. A good cap and thermostat (if equipped) will help. If this is a non pressurized system, unless you can find a way to put a couple pounds pressure on it, the odds are not good.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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