You can get the same result (and for about the same amount of time) with
good old black pepper, or cornmeal. (And if you're going to do such a
thing, it's better, though still not a great idea, to separate the egg,
toss the yolk, and just use the white)

Either way, it's, at best, a temporary fix, and at worst, a *REALLY*
expensive band-aid.

(Think "Let's see... rip out the engine, strip it down, clean the crud
out of the cooling system, rebuild, re-install... Aw, screw it - easier,
cheaper, and quicker to just go out and buy a new engine or a new
car...")

I prefer black pepper.  Easier to clean out after.  A half a shaker into
a rad can stop some bad leaks.  I was way back in the Canadian Bush and
over 100 miles from a garage when I had a rad core split.  I 'could'
have taken the system apart and done a proper solder fix, but it was
raining so I just tossed a handful of pepper in.  That held for several
months when I ended up getting a recore rather than fixing it again.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08.  Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com