Maybe we need to have a "Test the Product" Thread where a couple of us volunteer to but the "miracle" product and report back to the group? I for one think (its my my opinion, I have learned if you make a statement like that, you have to say it's your opinion, just in case you can be proved wrong, lol) this is a joke, a lot like the spray on hair they sell on TV.
It might fill the gap but to bond ? I have owned a metal sprayer and used it to hard coat Iron ways. It worked not so hot (pun), I had to get the metal so hot because the mach casting sucked the heat out of the area so fast. I just sent out some spindles to get the seal area's chrome plated. I know this is the old stand by and has worked for me hundreds of time in the past. I know there is a professional spray company in town and they have been in business for years, so it must work great in some places.