A solvent based primer that is specifically for metal and will help prevent rust is usually the best way to go for this especially in areas that come into contact with rain or other moisture.
How to get paint off of metal siding.
Use a mix of detergent and warm water to clean the area.
Then use a regular hose to remove the paint and stripper from the aluminum siding.
And every year i try a different method to get paint to adhere to steel siding.
How to paint steel siding.
Allow it to dry for two or more days before continuing.
Alternatively you can use mineral spirit instead of liquid wax and you can repeat the same process.
Rinse well and observe your siding when it is clean and wet.
You can test your siding first to see if everbrite will restore the color and finish.
Step 1 clean the steel siding.
For aluminum siding use a pressure washer set on low to spray the metal siding and rinse the rust off.
Oxiclean spray makes both a great laundry pre treatment product and a general household cleaning spray.
To use it soak a sponge in rubbing alcohol and hold it over the paint stain for several minutes.
Last year i took an air compressor and a hose and a drill and a wire wheel and went down to the bare metal.
Add liquid soap to the water to get the grime off.
Rubbing alcohol is a mild solvent that will loosen and soften very old latex paint spots from aluminum siding.
The first step includes cleaning.
For my paint drips i sprayed on oxiclean and waited for about 15 minutes then returned and rubbed it with a scrubber sponge.
Step 3 paint.
If it looks good when it is wet everbrite will restore the color and finish.
Step 2 tackle rust.
Rub a generous coat of the soyclean paint stripper on the aluminum siding.
A razor blade can remove the rest of the paint if the last two steps do not complete the job.
Put rubbing alcohol on a cloth and wipe as much paint as possible.
Step 4 retouch.
I had to use significant elbow grease not to some mention finger nail scraping for some of the larger stains.
Remove the sponge and scrub the paint spots up with a soft bristled scrubbing brush.
I tried a wire wheel on a drill.
And went to the paint store and they gave me some primer and some paint.
If you did not do a good job of scraping off the old paint or there is chalking that you can t get to come off then you should first paint with a primer.
Clean an area of your siding with a mild detergent like dish soap and water.
Wash the steel siding with trisodium phosphate tsp and use a pressure washer.