Why Does Paint Get Chalky On Aluminum Siding

There are several steps in dealing with a chalky surface to ensure a long lasting paint.

Why does paint get chalky on aluminum siding.

A dull chalky paint finish comes off when touched and makes a home s exterior paint job look dated. If after two tries of hand scrubbing or power washing there is still chalk on the surface simply use a primer before repainting the aluminum siding. Before repainting an area with chalking paint it is necessary to remove all the chalk along with any dirt and dust on the paint surface. This primer will cover up the chalk and allow the new paint to bond with the aluminum siding.

This oxidation that occurs on aluminum siding results in the build up of a chalk like substance on the siding itself which can easily be seen by wiping your hand across the aluminum. Why does chalking happen and what can you do about it. This is called chalking and essentially is the existing paint breaking down from the weather. One of the most important aspects of a paint job is the prep work.

Chalking due to oxidation is the paint s natural response to sunlight. Chalky surfaces will cause the paint not to adhere correctly to the surface and will cause premature peeling. If chalky paint is not removed it can eventually cause damage or discoloration to surrounding parts of the house. This phenomenon is known as chalking.

When paint on outdoor surfaces ages it develops a light but noticeable buildup of powder. This is a natural process.