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Fernox LS-X Leak Sealer

Fernox LS-X Leak Sealer
Average Customer Rating:
4.65 out of 5
4.7
 out of 
5
Open Ratings Snapshot
Rating Breakdown 103 reviews
5 stars
84
4 stars
12
3 stars
2
2 stars
0
1 star
5
98 of 103(95%)reviewers would recommend this product.
Customer Questions & Answers:
1 Question | 0 Answers
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
4 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: 
4 out of 5
4 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
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. "
24 of 24 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: 
4 out of 5
4 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: 
4 out of 5
4 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
Perfect for leak free basins
20 Jun 2015
By DesmoDan
, Exeter
" Ideal for sealing all types of sanitary ware.
Seals wastes in metal sinks really well because it stays flexible.
Any excess can be easily cleaned off with Big Wipes.
"
Review 3 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
Performance: 
5 out of 5
5 out of 5
Reliability: 
5 out of 5
5 out of 5
Weeping immersion heater
14 Jun 2015
By Morry
, Medway
" After three go's at fixing a weeping immersion heater that had been seeping for many years looking at the limescale around it, and thoroughly cleaning it each time, using a new gasket and only a little PTFE tape on the thread to lubricate, I finally decided to try LS-X. Drained it down again, a thin smear around both sides of the gasket (using the thin brown hard fibre type this time as opposed to the thicker softer ones} and after a week not a drop. Perfect seal, no dampness at all around the boss which is something I couldn't achieve before. So I am sold on LS-X . I am an old SEEBOARD electrician and in the 60's we used to fit loads of immersions using the brown fibre gasket and Boss White in those days, but as is said elsewhere difficult to get out again. "
Review 4 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: 
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: 
4 out of 5
4 out of 5
Performance: 
4 out of 5
4 out of 5
Reliability: 
5 out of 5
5 out of 5
Idiot proof plumbing
11 Jun 2015
By johntheballcock
, Bourne End
" I use on all threaded plumbing joints with great success. As noted before, it does go off quickly so I put lid on quick and wrap in clingfilm. It makes idiots like me look like half decent plumbers. Very pleased with it so far. "
1 of 1 people found this review helpful.
Review 5 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
Seems to work
9 Jun 2015
By Toolgrinder
, Nottingham
" Had a leak from the ballcock water inlet joint, first thought was PTFE tape then read loads of good reports about this so used it instead. Seems to have cured the problem. "
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
Reliable sealer a must have
1 Jun 2015
By dogwalker
, Southampton
" I have used several tubes now on different plumbing jobs seals quickly even in wet. A must have for the plumb bag/toolkit as you never know when you need it.
Only thing to point out the sealant goes off very fast so make sure you put the top back on the tube asap!!
"
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
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
Fernox LS-X
28 May 2015
By thecavalry
, Birmingham
" Been using this for years, works where nothing else will. So good I'm not even tempted to try other products any more, just make sure you put the lid back on straight away as it goes off in the tube if left unsealed. "
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
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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
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Reliability: 
5 out of 5
5 out of 5
Handy to have
28 May 2015
By woodenworm
, Norfolk
" Always keep a tube on the van as this exceptionally good at sealing and jointing better than your basic mastic and will react with moisture to cure faster. "
Review 9 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
excellent
27 May 2015
By Steve154
, London
" Always use this stuff and it has never let me down. A must have for any plumber in my opinion "
Review 10 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
Fernox SL X
23 May 2015
By Fireblade2000
, Dover
" Great product sealed first time on leaking basin waste.Never let me down yet.++++ "
Review 11 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
Great Stuff
21 May 2015
By GSR1
, Glasgow
" First time using this. Needed to get a seal on some older style radiators and was struggling with just PTFE tape. Smeared some of this sealer and left overnight. No problem with any of the rads. Perfect. "
1 of 1 people found this review helpful.
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
Top product
1 May 2015
By iMud
, London
" Tried another product as it was cheaper but was nonsense. Back to Fernox and job done. Keep reminding myself you get what you pay for..... "
Review 13 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: 
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: 
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
LSX the wonder sealer
19 Apr 2015
By WestSussexWoody
, West Sussex
" Brilliant stuff. I use it on all non soldered copper joints and many plastic ones. It is excellent for sealing some difficult joints like flexible pipes on pond construction. Be careful to keep the cap and screw thread clean or the stuff will dry up quite quickly. A little expensive for what it is but is does the job extremely well and remains flexible. If you should need to break the joint open in the future the stuff peels off easily ready for another application before tightening the joint again. "
Review 14 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
Performance: 
5 out of 5
5 out of 5
Reliability: 
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. "
4 of 5 people found this review helpful.
Review 15 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
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. "
3 of 3 people found this review helpful.
Review 16 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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Performance: 
5 out of 5
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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 17 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
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Reliability: 
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 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
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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 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: 
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
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Reliability: 
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 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: 
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
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Reliability: 
5 out of 5
5 out of 5
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.
"
3 of 3 people found this review helpful.
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