"I've been using the more expensive Fernox LS-X version of this product for a while now with excellent results and decided to buy a tube of the cheaper stuff to see if it was any different. I can confidently say that there isn't any difference apart from the price - a lot cheaper! Same performance, no problems apart from the tube drying up if you leave the top off for a while, same as the expensive stuff."
"No Nonsense External Leak Sealer did not seal the leak from the radiator valve connection. It did not adhere to a wet surface as claimed and was no better than ordinary silicone sealant, a large tube of which is much cheaper. Managed to seal leak using self amalgamating tape."
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Review 13 for No Nonsense External Leak Sealer 50g
"I bought this for a tiny leak on a radiator valve. The product looks and smells exactly like ordinary clear silicone sealant. The leak was from the 12mm micro-bore joint into the valve. I tried several attempts but it just kept leaking, only a tiny drop every five minutes but the sealant couldn't stop it. Looks like a full drain down and new valve/pipe is the only solution. Don't waste your money!"