That looks like a Timmy frame. Most paintball guns (except Tippmanns) are milled from billet aluminum... usually 6000 series. I doubt it is the aluminum.
It looks like spots from the prep process. I noticed you didn't de-smut sfter the etch process. I always do that regardless of alloy or lack of apparent smut.
Instaed of caswells etch, try red devil or drano brand chrystal pipe cleaner (sodium hydroxide). 1 can mixed with 2-1/2 gals. of water @ 65F.
Follow with caswells de-smut @ 110F.
Polish or beadblast, then degrease in lacquer thinner, then caswells SP degreaser @ 140F.
Ano immediately after the finish and cleaning steps.
Distilled or RO rinse between each step (of course).
After rinsing the ano electrolyte, submerge parts into a bucket of baking soda/water neutralizer.
Immediately rinse and dye after ano.
Hope that helps.
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