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Nix the painting. I do tank inspections in my day job (API licensed inspector) and I've seen many Al tanks ruined by coatings.

The 2 big rules are to keep the base out of saltwater, and be VERY careful with dissimilar metals (no brass or bronze fittings, only SS by code) and grounds. Additionally, there are some additives that greatly reduce Al corrosion. Practical Sailor did a review. As I recall Stabil and Star Tron did best. However, internal corrosion is mostly a steel tank problem.
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