Best CH leak sealer

[Charlie69]

I have a leak somewhere in my central heating system. I have tried the B&Q Plumbsure leak sealer, however this didn't work.

Want to try a different leak sealer before I lift the carpets / laminent?

What make would you recommend?

 

[45yearsagasman]

How much of a leak is it? Leak sealer has it's limitations. If you know where the leak is then repair it properly.

 

[Charlie69]

Not found the leak. Checked all radiators and no stains on the ceilings. The Worcester Engineer has checked the boiler and says the boiler is working correctly.

I'm thinking the leak must be in the pipework downstairs.

My boiler pressure drops 0.5 bar over a 48 hour period.

Is it ok to mix leak sealers and which is the best?