RE: Roller Bearing coating
I don't think you are going to have much success coating a bearing. The steel is very hard, and you will never get a good blast profile. As Gordon said, the coating will not be very strong to withstand the loads from the rollers.
We have sprayed onto hard steels before with our HVAF gun, and it worked because the particles were not liquid when they hit the surface of the part. The particles were able to penetrate the surface and embed themselves to build a strong coating. Our HVAF coatings have been shown to withstand 3.5 GPa point loads. You will never get that with an HVOF gun.
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