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How should I prep old aluminum siding before painting? What type of primer is the best for siding?

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How should I prep old aluminum siding before painting? What type of primer is the best for siding?

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A. Remove as much “chalk”, dirt and mildew as you can. This is done by power washing or by scrubbing and rinsing. The only times a primer would be needed are: 1) If any bare aluminum is exposed; then use a latex corrosion-inhibitive primer; 2) If there is still “chalk” left on the surface, apply a quality exterior alkyd, oil-based primer recommended for aluminum siding by the manufacturer.

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