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Fernox Leak Sealer F4 500ml

( 6 Reviews )

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Leak Sealer F4 is suitable to be used throughout a central heating system to seal small leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system it will be effective 1-24 hours after application.

  • Build Quality is rated at a 5/5 for Fernox Leak Sealer F4 500ml :

  • Ease of Use is rated at a 5/5 for Fernox Leak Sealer F4 500ml :

  • Features is rated at a 5/5 for Fernox Leak Sealer F4 500ml :

  • Value For Money is rated at a 5/5 for Fernox Leak Sealer F4 500ml :

  • Overall is rated at a 5/5 for Fernox Leak Sealer F4 500ml :

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6 Results

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Review for Fernox Leak Sealer F4 500ml by Verisafe (Derby) Ltd
19th March 2020

I have used this product on various jobs and have always been pleasantly surprised by the results. A quality product that give piece of mind.

I have used this product on various jobs and have always been pleasantly surprised by the results. A quality product that give piece of mind.


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Review for Fernox Leak Sealer F4 500ml by ADOGAS
13th July 2019

Have used this product since I started in the industry and it works really well. Only hardens when comes into contact with air. You can also use it with other sentinel products and doesn’t cause any issues. I usually put it into the bathroom rad if there’s available. Otherwise drain down the header tank to ensure it gets into the system and does the job. Or in the magnetic filter if there is one.

Have used this product since I started in the industry and it works really well. Only hardens when comes into contact with air. You can also use it with other sentinel products and doesn’t cause any issues. I usually put it into the bathroom rad if there’s available. Otherwise drain down the header tank to ensure it gets into the system and does the job. Or in the magnetic filter if there is one.


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Review for Fernox Leak Sealer F4 500ml by Heat Trend
2nd April 2019

have used a couple of times where I can't get to all the pipe work. does seem to work although got called back to one leaking a year after using this. be careful as not all boiler manufacturers allow it. should only be last resort

have used a couple of times where I can't get to all the pipe work. does seem to work although got called back to one leaking a year after using this. be careful as not all boiler manufacturers allow it. should only be last resort


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Review for Fernox Leak Sealer F4 500ml by Paul McGrath heating services
25th March 2019

Used this product quite a few times now where there is a small leak on system and am unable to find worked well on the ones I added it to no callbacks and not a big expense to customer

Used this product quite a few times now where there is a small leak on system and am unable to find worked well on the ones I added it to no callbacks and not a big expense to customer


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Review for Fernox Leak Sealer F4 500ml by Ultimate Plumbing and Heating Services
30th November 2018

I have used Fernox leak sealer for years now and have found it to be very good.I have tried other brands but I always return back to this product.I would recommend this if you cannot find the leak .

I have used Fernox leak sealer for years now and have found it to be very good.I have tried other brands but I always return back to this product.I would recommend this if you cannot find the leak .


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Review for Fernox Leak Sealer F4 500ml by Cliff Plumbing & Heating Limited
30th September 2018

Best leaker sealer I have used and well worth the money. 80% of the time when a customer reports losing a small amount pressure in heating system, one dose of this cures the leak. Will continue to only use fernox for leak sealer

Best leaker sealer I have used and well worth the money. 80% of the time when a customer reports losing a small amount pressure in heating system, one dose of this cures the leak. Will continue to only use fernox for leak sealer