Greetings:
There is a short article on Surface Preperation for Thermal Spray on Propeller; it is located at http://pplr.us/s/UU9I/ . I was not sure if there was much interest on this topic on CR4. If you have interest in it, you can go to the propeller link or go direct to www.thermalspraydepot.com.
Please let me know if you would like postings about thermal spray.
The Thermal Spray Guy