muggyweld - cast iron block - use it before?

got a cracked block and heard of muggyweld - no preheating of cast iron required - if you have used it successfully, let me know how and any suggestions for doing it right...thanks...johnnyB

 

Muggyweld is a VERY knowledgeable company when it comes to all things welding. I haven't used the CA rod, but I use their trick pre-fluxed brazing rod for stainless a lot and it's truly amazing. I would expect nothing less from the cast iron product.
Call em up. they're very friendly folks.

Russ

 

I have used it on potmetal with great success

 

http://www.muggyweld.com/?view=home

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anybody have a couple of 77 welding rods hangoing around for sale?....these things are not cheap - must be they work?