The stuff I take on my travels is the silicone glass stuff that comes in a bottle. I think it is much more popular in the USA, but it works a treat. I had a holed radiator which i could not fix with any method, radweld, chemical metal, welding.
This stuff just pours in the rad, heat it up and where it meets the air it will turn to a kind of glass compound. on some you have to empty it out but other brands allow you to keep it in the system where it will plug further holes.
I've done about 20 000 miles on this repair and it it still solid. Its supposed to work on blown head gaskets too, so, in my opinion, it is well worth the space it takes under the seat!
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