There are no short-cuts to fixing a leaking headgasket properly. Plenty of products out there to temporarily seal a leak (and allow the unscrupulous to sell the car on), but IF your KV6 head gasket has actually failed, then products like this are only delaying the inevitable, building up other problems and costing you money that could've been put towards doing the job properly in the first place.
Let's be honest, if it worked, manufacturers would add it to cooling systems when new to stop any chance of HGF in the future.
Don't waste your money
