Borrowing from the Chrysler experience (Subaru head gasket problems)

S

Sh.N

There are now several new "Block Sealer" products out with sodium silicate
in them, the most popular being the K&W brand. The alchemists called sodium
silicate "water glass" since it turns to glass when dried. When added to
coolant, first it is sucked into a crack by the intake suction, then the
exhaust blast dries some of it out and turns it to glass, making the leak
smaller. This continues with each stroke, the leak getting smaller and
smaller as concentric layers of glass are laid down, until the leak stops
leaking. Genuine MOPAR antifreeze, recommended in Chrysler owners manuals,
contain a small amount of sodium silicate to stop internal leaks as they
develop. Hence, leaking head gaskets and cracked heads are usually only a
problem if you haven't been using genuine MOPAR antifreeze as Chrysler
recommends. Sure you have them, but you never have cause to know about them.

http://www.allpar.com/fix/cracks.html
 

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