Found 24th Oct 2012
To be honest this stuff is usually best avoided, and the fault properly repaired. But at £1.99, if you're lazy like me, it might buy you some time before you can be bothered to fix the problem properly. I apparently have a persistent small leak, which I assume is via the headgasket, and just can't be bothered to sort it till it leaks more than the litre every 1000 miles or so it does at present. £7.99 @ Halfords makes this a good deal either way, if it's a product you're after.