I would have to agree with sevisehda, solder them on if possible. (filling the radiator except right were the barbs will go to reduce the risk of damage)
If you are using PVC to metal, JB Weld should work fine just make sure you rough up the surface of the brass/copper on the radiator first for best adheasion.
Per the JB Weld site...
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Mechanics -- you can use J-B WELD with confidence. It is designed for safe, reliable, permanent repairs in engine compartments and heated environments up to 500ยบ F (twice the heat-resistance of competitive products). It's strong as steel and impervious to water, gasoline, chemicals, and acids. Working with J-B WELD is quick, easy, and convenient -- and saves you time, work, and money!
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