hey, what caswell used before for the HCD anodizing was 1:1 of battery acid and distilled water. this worked out to be more specifically 25% sulfuric acid. the high current is what im using right now.
have you had any luck with figuring out your problem?
i found my problem was using dyes at room temp (which works fine for me) but out in the garage room temp this time of year can be too low.
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