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Putty/epoxy works but here's a handy tip I picked up from my materials professor to ensure that the crack doesn't propagate: Drill small holes at the ends of the crack to arrest its growth before using metal putty/epoxy to seal the existing crack. My dad used to own a Maxima that developed a crack in the radiator's aluminum head. The mechanic he took ...


If you can see and access the crack, a two-part epoxy or something like JB-Weld can be great for a temporary fix. This page shows the process on a metal radiator for a race car, but your fix would be similar. Clean the site of the repair, and rough up the surface with fine sand paper, especially if working on plastic. Mix the two-part epoxy and generously ...


If it is one of the veins that is cracked, in an emergency it is sometimes possible to cut the vein and then fold both ends over a few times to seal them. A pair of long nose pliers is usually all you need to do this.


A large number of people recommend sodium silicate - sold as "liquid glass in the US I believe. This is also used as an egg preservative. An excellent user discussion of sodium silicate and other materials can be found here. I'm in New Zealand. Here we have a material named "Soldrit Super Soda" which has been on the market for 40+ years (ask me how I know ...

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