Do your engine a huge favor and don't use that crap.
If you want to fix this problem, do a coolant pressure test to 18 pound, you'll find the leak real quick.

 

Lol, I just spent close to 3 hours replacing the spark plug wires without removing the upper intake manifold. Looks like it might have been a useless exercise. I'm hoping I can put a mirror to the back of the engine today if its not too cold (although its 6 degrees with the wind outside now) and see where the leak originates from. I'm also going to go to the nearest parts store to pick up some of that coolant leak stopper.

 

Sorry Mike, I hadn't seen your post. I'll book an appointment with a local garage to do the pressure test (it's too tall to fit in my garage and the weather is just getting colder). I'll see if I can rent one locally and find a garage I can borrow for an hour or so.

 

A car wash bay is always a good place to get out of the wind usually when its cold there is not much business and the attendant if there is one probably wont mind letting you close the doors for a few minutes.

 

Put in ONE bottle of Barr's leaks.
Drive for a few days.
If it needs more - put in another bottle.

Never more than TWO bottles ever.