Coolant leak- "Wonderweld" ?

[Homer Simpson's Lovechild]

Beta 16 with heat exchanger and calorifier.
Loosing coolant at a rate which seems to gaurantee high temp alarm at most critical moments.
I've tightened all hoses but have a significant drip from bottom of engine block - seemingly from the bottom nut on the flange between crankcase and gearbox although this is the low point and maybe the natural drip point.
I'm slowly coming to the horrible conclusion that an engine removal and gasket replacement is looking likely.
Before doing that I thought I might try a proprietary coolant sealer such as Holts Wonderweld.
Has anyone had success with this tactic or is this simply not suitable for marine engines?
Would I simply pour it into the flushed out header tank in the correct diluted quantity before circulating / draining and refilling ?
Any advice and or warnings very welcome.

 

[VicS]

Beta 16 with heat exchanger and calorifier.
Loosing coolant at a rate which seems to gaurantee high temp alarm at most critical moments.
I've tightened all hoses but have a significant drip from bottom of engine block - seemingly from the bottom nut on the flange between crankcase and gearbox although this is the low point and maybe the natural drip point.
I'm slowly coming to the horrible conclusion that an engine removal and gasket replacement is looking likely.
Before doing that I thought I might try a proprietary coolant sealer such as Holts Wonderweld.
Has anyone had success with this tactic or is this simply not suitable for marine engines?
Would I simply pour it into the flushed out header tank in the correct diluted quantity before circulating / draining and refilling ?
Any advice and or warnings very welcome.

Not used Wonder weld but I have use Holts Radweld to good effect in various cars with leaky cooling systems

Instructions appear to be to drain, flush, add Wonderweld directly via thermostat housing. Refill with water and run until repaired. Drain and flush again. Refill with antifreeze mix. But read the full instructions on the back of the pack before you buy.

Personally I might just use Radweld or Radweld Plus unless there was good reason to think the block or head was cracked

Give it a try. It might delay the inevitable strip down and repair properly until after the next change of ownership.