Larry,  The electrofusion process is 20 years old! I'm not suprised that a better coating has come
along. I know there are many metal coatings available. I also know electrofusion in it's time was
better than nickasil and other crome coatings, which were more prone to flaking. I am checking
into the detonation gun coatings which seem to be Mazda's coating of choice. While the US crome
coating may be touted, as a plating system it is limited by it's adhesion to the base material.
The advantage of the detonation gun coating is it's claimed adhesion strenght of over 35ksi. That
is higher than the 357 AL the castings are made from. The interesting thing is that the detonation
gun coating would seem not to be suitable for a bore, but much more easily put on a flat surface.
The opposite of the electrofusion process. Bill Jepson

 
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