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

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

Why does paint get chalky on aluminum siding.

If chalky paint is not removed it can eventually cause damage or discoloration to surrounding parts of the house. This is a natural process. 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.

The primer should be 100 percent acrylic and specifically manufactured for outdoor painting. 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. Chalky surfaces will cause the paint not to adhere correctly to the surface and will cause premature peeling.

One of the hardest surfaces to prep is a aluminum or vinyl siding that is chalky. Why does chalking happen and what can you do about it. Paint that chalks is much less troublesome than paint that peels. 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.

Chalking due to oxidation is the paint s natural response to sunlight. This phenomenon is known as chalking.

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