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Fernox LS-X Leak Sealer

Fernox LS-X Leak Sealer
Average Customer Rating:
4.618 out of 5
4.6
 out of 
5
Open Ratings Snapshot
Rating Breakdown 89 reviews
5 stars
72
4 stars
10
3 stars
2
2 stars
0
1 star
5
84 of 89(94%)reviewers would recommend this product.
Customer Reviews for Fernox LS-X Leak Sealer 50ml
Review 1 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
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Features: 
3 out of 5
3 out of 5
Performance: 
5 out of 5
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5 out of 5
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Would you recommend this product? Yes
Overall Rating: 
5 out of 5
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3 out of 5
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5 out of 5
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5 out of 5
Fernox Leak Sealer
12 Oct 2011
By CLDomestics
, London
" This product performs excellently for jointing BSP fittings as well as sealing 'old' weaping joints.
A must have for all tool boxes!
It is silicone based but the fittings are watertight immediately so you do not need to allow time for the paste to cure.
NOT FOR USE ON GAS FITTINGS. "
18 of 18 people found this review helpful.
Review 2 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
3 out of 5
3 out of 5
Features: 
3 out of 5
3 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
3 out of 5
3 out of 5
Features: 
3 out of 5
3 out of 5
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5 out of 5
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5 out of 5
5 out of 5
Good stuff
16 Apr 2015
By Diyboy
, Brighton
" Have used this over the years to prevent, or stop, leaks in joints in the water pumping and filtration system on our garden pond and it has always worked.
In addition it easy to remove when you disassemble. It looks very much like clear silicon sealant, but this is far more effective. "
Review 3 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
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5 out of 5
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5 out of 5
5 out of 5
It's never let me down
14 Apr 2015
By Poseidon
, NW London
" I've now been using LS-X across any number of plumbing applications for years and this compound - because contact with water helps it cure - has never let me down. If I want to be doubly sure that a foam ring or neoprene washer is properly seated and secure, I always add a ring of LS-X. You can't go wrong and you save yourself an awful lot of time and repacking seals. "
Review 4 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Best Leak Sealer On The Market
8 Apr 2015
By laas
, Berkshire
" Without doubt the best sealer on the market, and the best price at Screwfix ..Works on all surfaces wet or dry .. "
Review 5 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
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Performance: 
5 out of 5
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5 out of 5
5 out of 5
Recommended for fittings
6 Apr 2015
By CliffordC
, Poole, Dorset
" Recommend by a colleague at work to help seal a mix of old and new copper compression fittings.
Hope it helps seal the joints as per the reviews and the recommendation. "
Review 6 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
stopthatleak
29 Mar 2015
By veggie
, somerset
" had a small leak in our boiler and this worked a treat with absolutely no problem, recommended! "
1 of 1 people found this review helpful.
Review 7 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
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5 out of 5
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5 out of 5
5 out of 5
fernox LS-X leaksealer
28 Mar 2015
By Micklfixit
, cornwall
" top quality leak sealer guarantees leak free joints and threads. Ideal for sink overflow wastes and radiator valve connections etc. Instant seal even on wet surfaces.I have used LS-X for years with 100% success. Good price at screwfix and always available. "
1 of 1 people found this review helpful.
Review 8 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
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Value: 
5 out of 5
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Features: 
5 out of 5
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5 out of 5
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5 out of 5
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Does what it says on the tin
24 Mar 2015
By AB21
, Aberdeen
" After having great fustration repeatedly trying to stop constant dripping from the pipework and thermosat connections on a bathroom towel rail i purchased this based on previous reviews.
Drips are gone and no leaks what so ever, will never do anymore plumbing jobs without this.
"
Review 9 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
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5 out of 5
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Does what you hope it can...
22 Mar 2015
By sanddancer
, Tring
" Fernox make great quality products and I've used a variety for over 32 years. Their LS-X sealant has been a godsend over the years and provided a leakproof seal throughout numerous plumbing jobs. The ability to coat some bandage and then wrap it around a leaking pipe (as per instructions) allowed me to delay one repair until a more convenient time and better access. Joints can be released quite easily and the sealant cleaned off with your fingernails and a rub of a cloth. Does what you need and want it to. "
Review 10 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
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Performance: 
5 out of 5
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Reliability: 
5 out of 5
5 out of 5
Leak Sealer
20 Mar 2015
By Adam9453
, Harlow
" I bought this after a persistent leak kept weeping, One application of this and it was solved. Great product. "
Review 11 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
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Reliability: 
5 out of 5
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Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
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5 out of 5
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Total plumbing godsend
19 Mar 2015
By Regrev
, Bath
" If you've ever faffed about with compression joints that keep dripping no matter how much ptfe tape you use or how much you check washers and tighten, tighten, tighten... Then you need this stuff. Discovered it during last house refurb and use it now on EVERY plumbing joint - literally every time something with a thread needs connecting. Taps onto flexible hoses (smear a little around the thread), copper pipe compression joints (smear a little on the olive). Not had ONE leak. Always works to a drip free joint FIRST time. Magic. (I prefer to leave them to next day to test – just to be sure it's all gone off properly.) Dries to a firm rubbery compound that peels away so you can make things nice and clean (if they're on show) OR if you need to take something apart and do it again it's not stuck fast. Love it. "
Review 12 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
great sealant
26 Feb 2015
By Anonymous
, Darlington
" A must for all your sealant needs, I use this when doing all my plumbing diy "
2 of 2 people found this review helpful.
Review 13 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
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Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Super Duper Joint Sealer
25 Feb 2015
By chestnutfarmer
, Norfolk
" I've been using this for years, for plumbing and heating installations. I have only used it as a "belt and braces" sealant on threaded and compression/union type plumbing fittings, and have not had a single joint leak since I started using it. On threaded joints (i.e: radiator/valve etc) I still use PTFE tape and then a smear of LS-X. On compression fittings I put a smear of LS-X around the olive before assembling the joint. If you need to disconnect the joints later then no problem, the cured LS-X just peels off, and you can reassemble again without problem. Brilliant stuff, any excess just wipes off with rag, leaves a clean joint. It can apparently be used to stop leaks without disassembling, but I have not tried this so cannot comment. Lasts a long time, but you must replace the cap immediately to stop it curing in the tube "
4 of 4 people found this review helpful.
Review 14 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
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Features: 
5 out of 5
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5 out of 5
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5 out of 5
5 out of 5
EXCELLENT SEALER
23 Feb 2015
By POPEJR1
, SPALDING
" NO PROBLEMS USING THIS PRODUCE, JUST GET THE TOP BACK ON TUBE ASAP. IT SOON GOES OFF "
Review 15 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
A must for compression joints
19 Feb 2015
By FinalFix
, Cambridge
" I started using LS-X some years ago and can say that it gives me that feel-good-factor when using compression fittings - especially on older pipework. Gone are the days of wrapping PTFE tape round olives that are weeping!!! I use LS-X ALWAYS and I have never had a fitting even bead a drop of water AND it is safe for drinking water .. RESULT!!! "
Review 16 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
4 out of 5
4 out of 5
Performance: 
4 out of 5
4 out of 5
Reliability: 
4 out of 5
4 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
4 out of 5
4 out of 5
Performance: 
4 out of 5
4 out of 5
Reliability: 
4 out of 5
4 out of 5
Top product
4 Feb 2015
By TonyH1
, Gloucestershire
" Fernox LS-X is a great product to have in your toolbox to fix leaks and seal water pipes etc. The instructions are good and the product is easy to use. I would recommend still using with PTFE tape to seal joints etc to give an instant fix but Im sure on its own given reasonable time to cure it can do the job "
Review 17 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
4 out of 5
4 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Fernox sealer
24 Jan 2015
By HANDYADA
, DEEPING ST JAMES LIN
" I got recommended fernox by a plumber so always keep a tube it is good stuff i have got it to seal joints where other stuff did not "
2 of 2 people found this review helpful.
Review 18 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
liquid gel transformation
7 Jan 2015
By Brownsox
, Kings Lynn
" Used it to seal around replacement washer leading from cold water tank. The original hole I think had been drilled a little too large, but the gel was easy to apply and set quite quickly. No leaks so far!
Remember to put the cap back on promptly
"
2 of 2 people found this review helpful.
Review 19 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
3 out of 5
3 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
5 out of 5
5 out of 5
Performance: 
3 out of 5
3 out of 5
Reliability: 
5 out of 5
5 out of 5
keep some to hand
28 Dec 2014
By najp1987
, berkshire
" i always keep a tube or 3 in the van excellent product and has not failed yet on stopping weeping joints on old compression fittings however a pro to a con is that its very quick to cure which is good for sealing the leak but also ends up curing in the tube if you dont get the cap on quickly "
4 of 4 people found this review helpful.
Review 20 for Fernox LS-X Leak Sealer 50ml
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
4 out of 5
4 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Would you recommend this product? Yes
Overall Rating: 
5 out of 5
5 out of 5
Value: 
5 out of 5
5 out of 5
Features: 
4 out of 5
4 out of 5
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
excellent for sealing leaks
17 Dec 2014
By strayman
, Harrogate
" I used this to seal some joints on old pipework about a month ago and the minor leak has gone and not returned. "
2 of 2 people found this review helpful.
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