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What exactly is that? Cleaner, an acid, or a base? Metal pretreatment?
Aluminum is often unreliable and unpredictable to bond to. Try a different epoxy as the first coat, don't wait too long after sanding. It's also somewhat susceptible to corrosion when in direct contact with carbon. In aviation aluminum parts are therefore pretreated with certain chemicals before epoxies are applied, not because this enhances bond strength (it sometimes doesn't), but because it becomes more predictable and will last longer.
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