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Stopping aluminium window frame corrosion

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I would like to find a way to stop spot corrosion of my powder painted aluminium window frames. The corrosion is occurring at spots on the sills, often near the cement between the bricks. The bricks are a limestone type. The corrosion has been taking place over a number of years and is still current.

Christine Corcoran
homeowner - Bunbury, W.A, Australia

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Lime from mortar is extremely aggressive towards aluminum. Frequent repainting may be the only practical solution, I'm afraid.

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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