Are you going to strip the old paint? If not you need to scuff it with something like a 3M pad, and apply a sealant that is compatible with the top coat paint you will use. If not the paint will likely peel.
If you do strip it, then you are in for a whole different job. You must prime the aluminum with something like Allodyne, then use a primer, then the top coat.
Putting the top coat directly on the old paint, or on raw aluminum is not a long term solution in my opinion.
If you use Imron, be very careful. It is extremely toxic to breathe. It is a cyanoacrlyate catalyzed paint that basically adheres to your lung tissue like superglue.
You MUST use a respirator with supply air.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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