But first, I would power wash the siding, or at least scrub it down with a good industrial strength soap.
Then rinse it thoroughly and allow do completely dry.
Prep any areas with spackle or caulk
Prime the entire area. Use a good quality primer like Zinser product.
then begin you final coatings. Use a good paint from a paint dealer NOT from a home center.
In paint, the higher the cost, the better the product.
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