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All sealants works on the principal of plugging the leak when the material in the coolant is heated by the combustion gases. The material solidifies and viola, it plugs the leak. I used Blue Devil which is silicon sulphate. It turns into glass when heated. It works for 20k miles on one of my sdl which is pretty good, all things considered. It is definitely not 'permanent' but a good salesman tool to sell the car. If you are selling the car then it is good to go. If you are keeping it then it buys you some time but borrowed time. May be 1 year or so. The other thing is to NOT pressuring the radiator if you think the car is ok. My experience is that pressuring the radiator may dislodge the plugging material. Good luck.
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