It is not a good idea to rely on coolant additive to temporarily fix the problem for that long mate, but it is your vehicle at the end of the day. You can use from more expensive "Steel Seal"(basically sodium silicate, nothing more) to all the other head gasket fix products from auto parts shop. I paid over hundred bucks for Steel Seal years ago not realizing how badly it gummed up the water passages between the head and the block, and FIIK what it has done inside the radiator. These are products meant to get the car going for a little while in an emergency situation, rather than for months. Sure occasionally people do take chances and 'succeed'.
For a turbo diesel engine it is an extra challenge I reckon. Try Chemweld or similar product by all means, but it's better to pull the head out and fix it properly. It can be fixed under 1k with a brand spanking new cylinder head(not a reconditioned one) if you're ok with DIY with a bit of elbow grease.
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