"Great buy, almost half the price of other branded products. It worked really well when dealing with a radiator header tank. It was no where near as smelly as other brands and when working in a closed in roof space with no ventilation this proved a real bonus. It was also easier to apply and tool than other products. Will definitely buy and use again. Have give 3 start for reliability as I have only just put it on, otherwise a 5 star product."
"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."
"'External leak sealer' is misleading. This is a joint sealer, for compression or threaded fittings. I can see I would use this if I had a compression fitting which was weeping and I couldn't get it any tighter. In fact, the best name for this would be 'Small Tube of Clear Silicone Sealant' which is basically what it is.
I bought this for a temporary fix on a pin-hole radiator leak which it was totally unsuitable for. Isn't that an 'external leak'? I actually needed some Araldite."
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Review 14 for No Nonsense External Leak Sealer 50g
"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 15 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!"