Heres the worring bit :

I researched the market and found that an American company has been
producing this sealer for the past 35 years and had supplied the engine
re-building industry with it. This product worked for me.

Has anyone ever bough a re-conditioned engine?

Cracked block???.....fill with ironite.....Sell it on as
reconditioned.....Scarey

I guess if you _have_ a cracked head it might be worth a try, it's
certainly cheaper than a replacement.  But maybe that's what they want
you to think.  Look at the wording, "It's very easy to use, all you
need to do is add it to clean water in the system, no anti-freeze, this
is very important. I recommend using a radiator flush first" ... I
suggest that's going to be the 'get out of jail free' clause to be
invoked when the stuff doesn't actually do what it says on the tin.

I wouldn't use it.

But please, you feel free and report back your findings ... in a
properly scientific manner, of course, none of your mumbo-jumbo, usual
beat around the bush, malarkey.

;)

It works bloody well.  I used it to sort out a Pajero with a leaky head
or head gasket a month or so ago - the vehicle in question happily
travelled 800 miles home and is still running well.  With the way it
works there's no point in using it if you haven't got a problem.

I think the seller is taking the piss on price though - thats seems to
be over twice what I paid for it here, and a bit of googling shows it
available for US$11.95.