What's the alternative? How bad is the leak?
I would tend to get it fixed properly in Russia where they have the facilities to do a half-decent job. Or just replace it if possible / economic. Mongolia has some wicked corrugations and is generally not a smooth ride (or you're doing something wrong if it is) and so any weakness will be exploited.
Using epoxy is a good field bodge to get you to a town, but for a mid to long term fix it will likely be insufficient. I imagine it has a very different rate of thermal expansion then the aluminium which (I assume) the radiator is made from, so after a few heat cycles it will probably separate.
A better fix is soldering / welding, or just blocking off the bad coolant passage by crimping it up... but I guss you don't have much redundancy with a tiny bike rad.
I spent years with a weepy radiator and despite numerous 'fixes' it never lasted long. What a moment when I pulled the damn thing out one final time and replaced it with a new one.
EO
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EurasiaOverland a memoir of one quarter of a million kilometres by road through all of the Former USSR, Western and Southern Asia.
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