Best Primer For Aluminum. Primer does not penetrate the remaining chalking so you need a paint additive. This can be accomplished with medium-grit sandpaper to help scuff the surface.
For these jobs an epoxy zinc-free power primer such as TIGER Dryprotector 6970000 would be best suited for aluminum substrates. Now mix and apply Epoxy Primer directly on to the bare aluminum. This will give you a high-performance paint job that will stay durable in all weather conditions.
It is a 2 part paint and you mix the activator immediately beforee use.
A good washing with a scrub brush and mild detergent will clean most of the chalking off the aluminum. Top-Tip Use an olive drab primer when your topcoat is of a green variant. This can be accomplished with medium-grit sandpaper to help scuff the surface. Top-Tip Rather apply a zinc-rich primer in those areas.