Dang frost plug leak

Sedanman said

You can use the powder radiator stop leak. I used it on my leaking heater core in my 94 van 6 months ago and still not leaking

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It used to be called Silver Seal I think, and that stuff does work good for those kinds of leaks.
Still is called Silver Seal.:D

I was going to mention that it doesn't make a mess like some of the other stuff, and doesn't plug other things up.
As a matter of fact you will probably never know it's there, as it is just a silver colored powder.