"COATINGS on CASTINGS"
All jets and related parts produced by American Turbine are anodized and powder coated except for intakes that are welded in aluminum boats. All our aluminum impellers are hard anodized type III MIL. spec.
When we bought Dominator in 1998 we started anodizing all the parts.
The first Berkeley I worked on in 1968 was hard anodized, coated with an epoxy zinc oxide primer, then painted white and I believe they were done the same way until CP bought them. I not sure how CP coats them.