coolant leak gu patrol 3ltr

hello all, just some information. had a small coolant leak from engine of patrol.
was told, it could be from anywhere. head to block, block to timing case, timing case to water pump housing. I tried a new product from Nulon called, radiator & engine block stop leaks. it comes in a round bottle of 500ml ,not in the bottle like injector cleaner
which they also sell. it contains kevlon fibres and forms a glass type permanent seal
IT WORKED.. it stopped the leak and nulon technical department told me I could leave it in the coolant, will not block radiator. seems a good alterative to costly repair.... bill