"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"
"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!!!"
"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"
"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"
"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"
"Always have a bit of this on your van. It has got me out of trouble many on times on weeping compression joints and other things . Remember to put the top back on straight away because it goes off very quick."
"I swear by this stuff. I wouldn't attach a brass compression fitting without first smearing a bit on the pipe and i've never had a bad joint yet. I've also used it along with ptfe tape to attach every rad valve in my house when I changed the rads with no probs. Its safe for aquatic use too so fine for drinking water pipes as well as central heating pipes. I even used it to seal a crack on a plastic fish tank a couple of years ago and the fish is still going strong."
"I had read all the reviews about this and thought I had better buy some, as a 1st time woman DIYer I highly recommend it, its easy to use and yes it stops the leaks a wonderful product that everyone should keep in their tool box."