Exterior Paint


Old 05-17-02, 10:20 AM
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Exterior Paint

What does it mean that my exterior paint is oxidzing? Our home inspector listed that as a defect on our list of home improvements. Our home buyer wants us to paint. We have hardy plank siding that is 4 years old. Isthis cosmetic?
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Old 05-19-02, 02:14 PM
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If it is oil, it is likely appearing like alligator hide, if not, it will be chalky and dusty in appearance. At any rate, since you're selling, a quick coat of primer and then good paint or a pressure-wash will temporarily mask the problem. Painting will look better and increase your resale value. Here's a brief explanation of the cause and effect of oxidation:


Last edited by KeithP; 05-19-02 at 02:31 PM.
Old 05-19-02, 02:17 PM
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Oxidation of exterior house paint

Cause of Condition

Chalking--or powdering of the paint surface--is caused by the gradual disintegration of the resin in the paint film. (The amount of chalking is determined both by the formulation of the paint and the amount of ultraviolet light to which the paint is exposed.) In moderation, chalking is the ideal way for paint to "age," because the chalk, when rinsed by rainwater, carries discoloration and dirt away with it and thus provides an ideal surface for repainting. In excess, however, it is not desirable because the chalk can wash down onto a surface of a different color beneath the painted area and cause streaking as well as rapid disintegration of the paint film itself. Also, if a paint contains too much pigment for the amount of binder (as the old white lead carbonate/oil paints often did), excessive chalking can result.

Recommended Treatment

The chalk should be cleaned off with a solution of l/2 cup household detergent to one gallon water, using a medium soft bristle brush. After scrubbing to remove the chalk, the surface should be rinsed with a direct stream of water from the nozzle of a garden hose, allowed to dry thoroughly, (but not long enough for the chalking process to recur) and repainted, using a non-chalking paint.

http://architecture.about.com/librar...ef-paint06.htm (Retrieved 05/19/02)

If the chalking is indeed "excessive," perhaps you can make an allowance and reduce the selling price in the amount of the cost of the paint job
Old 05-19-02, 02:29 PM
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True, and the complete explanation can be found here:


The best solution is to use a quality primer, followed by a latex paint with a higher than flat finish, such as a satin, low-lustre or eggshell finish.

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