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Sentinel Internal Leak Sealer 1Ltr (99730)

Internal Leak Sealer for small inaccessible leaks and weeping joints in all types of indirect heating systems including those containing aluminium components. Compatible with elastomers.

  • 1 Year Guarantee

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£14.69INC VAT (£14.69/Ltr)

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Sentinel Internal Leak Sealer 1Ltr is rated 4.7 out of 5 by 32.
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Rated 5 out of 5 by from Great product Great product works well.Easy to use.Was a bit reluctant to try it but happy I did stopped leaks instantly
Date published: 2017-07-30
Rated 1 out of 5 by from Did not work for me I have had an ongoing issue with a slow loss of pressure in my sealed heating system. Having spent hours checking every accessible joint, i could not find a leak and thought i would give this a try. Sealer was added as per the instructions but to no avail. I also noted a change in the tone of my boiler for a couple of days as it passed around the circuit. A friend suggested i tried Fernox F4 instead and it worked a treat. I guess you get what you pay for?
Date published: 2017-04-07
Rated 5 out of 5 by from Excellent product Had new boiler installed using original pipework after having a small leak that meant combi boiler needed topping up everyday. Got to stage where I was going to bite the bullet and have my kitchen floor dug up to try to locate it as I was worried about the amount of water potentially seeping out somewhere, but thought what the heck I'll try leak stopper, not really expecting it to work due to the amount of water I was losing. Went to screwfix to get fernox F4 leak stopper, but was out of stock so the girl suggested Sentinel. I got it for half the price of the Fernox. Next morning I drained off a litre of fluid from the system after switching the system off etc. I then went to the towel radiator in the upstairs bathroom, checked the pressure was off, then removed the large filling nut and poured the sealer in. It's quite thick stuff a bit like PVA glue and tbh I didn't think it'd work as I struggle to get my head round it lol. I retightened the nut and repressurised the system and switched it on and let it run, and waited. Well it's three days on, I know it's not that long but I haven't had to top system up at all, bearing in mind I was topping it up every day, and it might be me but it appears the heating is hotter, but that might just be me. This has, hopefully saved me a massive amount of work and money and I just hope it continues to work. Give it a try
Date published: 2017-04-06
Rated 5 out of 5 by from Save on digging up the floors Had a tiny leak somewhere under the ground floor, so that the pressure kept dropping. No weep from the pressure valve, so I thought that I would try this stuff. 48 hours later it all looks good. Did a complete drain and flush before adding it using the simple filling kit into a radiator, together with the Sentinel inhibitor (which I had already bought). Can't give meaningful ratings for performance or reliability, as only 2 days into service.
Date published: 2016-12-20
  • y_2017, m_8, d_18, h_5
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_32
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Can this be used on drinking water pipes?

If we looped it back on itself for a few hours to seal the leak and then flushed it clean, would it subsequently be safe to drink from?
Asked by: Jonnnpipes
Hi there, Sentinel Leak Sealer does not have any approval for use in drinking water applications and so we can’t recommend its use in such a situation. Also it is debatable whether or not it would work on a cold system as it normally requires 24 hours circulating on a heated system, the evaporation at the point of the leak helps form the soft seal to plug the hole, we can’t see this happening on a cold system. Kind regards Customer Service
Answered by: Sentinel Product Help
Date published: 2017-07-03

ferroli he 31c combi boiler

have a very small weep on a joint in the above boiler is this suitable for this problem. thanks
Asked by: Dave647
Hi there, Sentinel Leak Sealer is suitable for your problem. However, preventative action is equally as important being prepared with a solution. The central heating system should be cleaned and then treated with corrosion inhibitor to the correct level in order to prevent corrosion-related leaks. For further information please visit our website. Kind regards Customer Service
Answered by: Sentinel Product Help
Date published: 2017-06-24

Gloworm 30c.. will it work with this boiler

I have a 2 year old glowworm 30c condensing boiler. Kept all the existing radiators and pipework. Have had problems with pressure dropping off since almost day 1 . suspect there is a small leak somewhere . Is this safe to use on such a combi ???
Asked by: Charlie1964
Hi there, the Sentinel Leak Sealer is safe to use on Combi boilers. For further information please visit the Sentinel website. Kind regards Customer Service
Answered by: Sentinel Product Help
Date published: 2017-05-06

Can I use it with 8mm pipe

Is this ok with 8mm copper pipe, the boiler holds pressure when the pipes are hot but loses it after around 4 hours of it going off
Asked by: Curlydecorating
Hello there, Yes the product can be used with this sized pipe. Kind regards, Customer Services
Answered by: Sentinel Product Help
Date published: 2017-04-29

Can this be added to the header tank, or does it need to be added through a radiator/towel rail. As a non-plumbist, I'd prefer the simplest route for application.

Asked by: Anonymous
yes use the towel radiator after tacking out sufficient water also add inhibitor at same time
Answered by: lollahmed
Date published: 2017-06-16
  • y_2017, m_8, d_18, h_12CST
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  • clientName_screwfix
Specification
Brand Sentinel
Manufacturer Guarantee 1 Year Guarantee
Pack Size 1
Pieces in Pack/Case 1
Product Type Internal Leak Sealer
Volume 1 Ltr

Downloads

Safety Data Sheet (COSHH)