I too, am going through this decision processes.
As far as blasting goes. It depends. The problem with glass beads is when the beads get old and fractured they leave a rough surface.
I was hoping to get a new and clean look to my valve covers, with some shine. I was envisioning a finish something like what is on the lip of the original Fuchs. A clear coat with a semi-polished look.
I ended up polishing my valve covers, since I was never happy with how "clean" I could get them. I think I got them too shiny.
I'm thinking I'm going to leave them for now and see how they "age". My hope is they will stay clean since they are aluminum rather than the old mag type.
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Gordon
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'71 911 Coupe 3,0L
outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage