Generally speaking, you should always follow manufacture directions.
If the label says not to use it on aluminium, then they put it on the
label due to a risk of damage. What you would have to weigh is how big
of a risk is it. Odds are pretty good that it would do limited damage,
since if it weakened it by 1% or in 1% of cases it caused a 50%
weakening it would be worthy of the warning.
In short, if you ignore the warning, you do it at your own risk.
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