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Spray.Bike reckons you can paint direct to substrate. The blasting will leave a pitted surface that will give a uniform surface for the key.
Rawing by hand will avoid that pitting and allow you to polish and leave areas exposed if you wished.
If I had access to a £30 media blasters I'd raw by hand, polish as best I could, slap some vinyl masks on the shiny bits, get it blasted, then remove the stickers to reveal the graphics in the polished areas. You get to add branding/logos/flourishes/design elements that are much more resilient than paint because they're in the metal. It's a finish that can only really be achieved on alu/stainless/Ti. And it matches every colour...
Here's an example... https://www.instagram.com/p/Bd2g5nnnRBi/?utm_source=ig_share_sheet&igshid=1l2awb55lr1pq
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general_greyharbour
Once I go fully raw, do I have to fiddle with primer and stuff?
I was going to use that spray.bike stuff.
The other option is I can save myself the effort/time/etc and get it blasted for £30.