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.
Best primer to use on aluminum siding.
Acrylic primers provide a stable base while sticking to metal and not reacting to any oxidation on the siding.
Here s where a lot of people make a mistake.
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.
Some books and magazines on painting recommend that you prime aluminum siding and or paint over existing aluminum siding with water based primers.
I would use a water base dtm bonding primer on any bare spots.
Remember that acrylic primer should only be used on acrylic paint.
All of the chalkiness must be washed and scrubbed off and any flaking paint removed.
The key to painting aluminum siding is preparation and priming.
As mentioned before 100 percent acrylic latex paint is the best paint to use to paint aluminum siding.
In a nutshell you need to start with a clean palette.
You should not use latex primer because most of the time it contains ammonia.
Required tools for this how to paint aluminum siding project have the necessary tools for this diy project lined up before you start you ll save time and frustration.
Read on to find out more.
Coat on the product with a synthetic polyester paintbrush covering the full surface area before allowing the primer.
This can spell disaster.
For best results begin with an application of galvanized metal etching primer.