And then i would use the rust oleum top coat.
Painting steel house siding.
When ready pour the primer into the paint container on the sprayer or pour the primer into the paint tray.
Begin by thoroughly cleaning your siding of all loose dirt chalk and other contaminants.
This will help clean away all the dirt that accumulates on the steel siding.
For steel use a latex bonding primer instead of a regular metal paint primer.
Since any of this is clearly bad for your metal siding it is vital that you re paint your metal siding.
Do this as soon as any spots start to show the steel underneath or do it a little sooner if you are trying to sell your house.
This is followed by fading and thinning of the color.
Wash the steel siding with trisodium phosphate tsp and use a pressure washer to rinse thoroughly.
The first sign that this is beginning to happen is a loss of the glossy look that new siding has.
It also helps to peel away the previous paint on the steel siding leaving it neat and clean.
When this happens the metal is exposed to the elements and will start to eventually rust.
Start at the top of the wall and across the length of the metal siding.
But i would use the oil based rust oleum primer which by the way takes forever to dry.
As with all exterior painting projects proper surface preparation is the key to restoring your metal siding.
Aim the sprayer nozzle directly at the panels eight inches from the siding surface.
Then apply the primer to the metal siding in even strokes.
Cleaning of the surface can be done by hand washing with warm soapy water or with the use of a high pressure washer 2500 psi minimum.
That is how you can get the paint to adhere to steel siding.
The first step includes cleaning.
Step 1 clean the steel siding.