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[Ricky043]

Just checked on Ebay. It's called K-Seal. In a blue bottle with orange label and blue writing.

[Doctor Gollum]

For the love of all that is Holy, don't use any magic goo. Ultimately it might fix a leak but probably at the expense of the radiator and heater matrix... with their associated consequences.

[Migv6 le Frog Fan]

If there is no visible leak have it pressure tested to make it visible.
Then just about anything but blown head gasket should be reasonably easy and cheap to fix.
If it is proven to be a blown head gasket, there is a decision to make.
If it isnt worth spending the money to fix that then theres a case for using a sealer and hope the car will last a bit longer, rather than scrapping it straight away.
I would only consider using a sealer in those circumstances. Anything but head gasket, fix the problem.

[Doctor Gollum]

Thing is, misdiagnosis followed by a half arsed usually makes matters worse.

On the Omega, a weeping water pump isn't necessarily obvious with out removing the cambelt cover... Likewise coolant dripping at the back of the block is several times more likely to be from the thermostat housing or oil cooler or HBV than a head gasket.

Also don't rule out the fact that a leaking heater matrix will get about a gallon of coolant into the padding under the drivers footwell before you realise that's where it's leaking.

[Migv6 le Frog Fan]

Schrader valve attasched to an old coolant cap and pump it to something like 10psi. It should then be pretty obvious where the leak is.
Back of the engine a mirror and a torch may be needed but shouldnt be too hard to find.