I would use water base because unlike oil base it won t become brittle and crack down the road it will expand and contract with the siding and it can also withstand heat better than oil base.
Good primer for aluminum siding.
As long as the siding is clean you won t need to use a primer unless raw metal is exposed.
Use the directions on the tsp package to mix the cleaner correctly.
Acrylic primers provide a stable base while sticking to metal and not reacting to any oxidation on the siding.
I would use a water base dtm bonding primer on any bare spots.
You can use a cleaner specially designed for aluminum siding but a mixture of trisodium phosphate tsp and water works just as well.
You should not use latex primer because most of the time it contains ammonia.
How much does aluminum siding paint cost.
Painting aluminum siding faqs how long does paint last on aluminum siding.
You can add a cup of chlorine bleach to the mixture if your siding also has mildew on it.
Flat white interior exterior aluminum primer spray 6 pack.
Rust oleum professional 15 oz.
Finally since metal is such a good heat absorber avoid painting siding while it s getting direct sunlight.
This can spell disaster.
Aluminum siding only needs to be primed if you have bare aluminum.
The problem is that there are quite possibly pinholes or cracks that are not visible to the naked eye where the old aluminum paint has worn off.
If you prefer an acrylic primer you may do so use.