water glass (sodium silicate- egg preserver) is an exlnt bandade for temporary head or block cracks, it really works, BUT, if you dont follow the directions exactly as stated on the bottle you will plug your radiator solid, make sure you have the head surfaced before you re-install it, if you dont chances are you will have the same problem, use a copper gasket, its so much easier to clean the head and block with a copper gasket than a composition gasket which sticks to the block and head, torque in 3 stages and then every 100 miles till the bolts quit turning