Siding and gutters: How to paint metal exterior surfaces

Exterior metal surfaces often need special treatment if they are being painted as part of an exterior painting project. It’s important to keep metal surfaces protected from water, customers often ask us how metal should be painted.

Over time exposed metal will be exposed to water, over time this will lead to rust and breaking down of the metal. Keeping the surface painted serves as a layer of protection to slow and halt rust from forming.

Steel

It’s important to keep water and air off of your steel. Here is how to create a protective barrier with paint on steel.
To paint or repaint steel, run a wire brush over any areas where rust may be or has developed.

Get a specialty primer from your local paint store. It will state on the can that it is rust-inhibitive. Applying two coats, with drying time in between, will create an extra strong protective layer.
Apply your paint. It’s suggested to use 100% acrylic latex or oil-based paint.

Spraying: spray painting is a good option for steel. Follow all directions from the can. If it’s possible, remove the project and place it on a work bench where you have access to the sides for an even finish. Short, fluid strokes will provide a solid finish.

DTM Paints
Some paints are sold as a direct to metal or DTM paint. They are specially formulated for application on metal without a primer.

Aluminum and Aluminum Siding

Aluminum siding can chalk or wear down if you live in a harsh climate. Refresh your home without a full residing by painting exterior metal.
Make sure the metal is clean and dry. Remove any dirt, grease or stains.
Cover any nearby areas to avoid getting paint on it.
Prime the metal with anti-rust primer. This will create a good surface for adhesion and prevent future rust breakouts. Allow full dry time.
Use a rust preventative enamel on top. Apply several thin coats and allow to dry completely.

Aluminum and aluminum siding can be painted with good results, but there are a few issues that can happen.

Chalking can happen when the coating is very weathered. If you run your fingers over a piece of your siding and it comes off white, you have chalking. Use a cleanser like trisodium phosphate before you start your project.

Finish suggestions for aluminum siding are to use a flat or satin finish paint. Since the aluminum is prone to dents, this paint will hide small imperfections. A glossy finish will accentuate dings.

Spraying: Since siding is not able to be removed for painting, be conscious of nearby items. Put down a tarp or drop cloth to protect nearby bushes, ground or plants. Take into account the wind and any overspray that may overreach your drop cloth.

If you need help with an exterior painting project on a property in the greater Missouri City service area, contact us for a free painting estimate.