Have any of you had any experience with this stuff? My son's '06-plate Citroen C3 has a coolant leak, from the rear of the engine, and from what I can see with it running and having looked at Citroen forums it's one of the corrugated hoses which runs from the water pump to the fuel heater ( I think) and back. https://citroenc3owners.com/questio...troen-c3-f11/coolant-leak-need-help-t791.html You can see the pipes on a drawing about half-way down this post. They are right behind the engine, and the engine bay is as cramped as a cramped thing, so I thought I'd see if there was another way we could try first. I presume this is the same sort of stuff as Barrs Leaks, which my late father always viewed as a bodgers solution, but if it works and saves us having to do the sweary two-step, all the better!