I have sealed up a heater core by pumping hot water and stop- leak through just the core. That was over a year ago and still no more leak. I used a small submersible 12v bilge pump. heard about it on this forum and it worked great.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"