Coolant tank repairable????

[quattro toronto]

My A4 coolant tank has cracks and is leaking a bit of coolant.
This thing repairable?   Im thinking of patching the hairline cracks with 
something..hopefully you can tell me what to use.

I've said it before, Im disappointed with some of the materials that were 
used on this car, namely the suspension links (squeaks), lighter,
electrical gremlins and now the coolant bottle.
My 85 coupe has 300,000 km, engine is bullet proof and pulls strong. The 
original coolant tank is now darkish yellowish but is damn SOLID for crying 
out loud.
I can whine can't I?
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