A friend of mine told me he was having problems with his central heating and kept having to top the pressure up. I said he probably had a leak somewhere, so he has had a plumber round and could not find the leak and has put some sort of liquid in the system to seal it and my friend said it has fixed it. My question is this would this seem a long term fix or would the leak still need to be found in the future to make a long term solution.
