Hello Peddy, in work I used to use a can of air Leak Detector, this stuff would pick up the most tiny of leaks giving a mass of bubbles. Max. pressure was about 120 lbs. so low pressure.
So I gave this one a squirt and it was like a major explosion in a bubble factory. I have heard, but not proved, that the 'O' rings as original are not of the best quality. As soon as I can I will order some English ones.
I will be back with what happens.
Cheers.
Geoff.