Unlike wood, metal siding is easy to clean with a solution of water and sodium phosphate, and it dries almost instantaneously. However, it must be sanded and primed with two coats of oil-based primer before it’s painted. Oil-based products are a little more expensive than water-based primers, and they take longer to dry. Applying two coats could add an extra day’s labor to a painting project. House Painting Thornton
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