Exterior Painting Advice on Primers
Different exterior surfaces require different types of paint and and often times primer. The fact is a primer coat is an excellent idea. I prefer oil based primer as it tend to penetrate deep and drive out moisture. It also give an excellent bonding surface for the new coat.We also generally, use primer whenever paints layered over one another may be incompatible (acrylic- over oil-based paint, for example), when the underlying surface may be porous (such as with bare wood), or when there is already a layer of existing paint that has fallen into disrepair (be sure to prepare the painted surface following the directions in Preparing Exterior Siding for Painting).



If painting over a wood surface, always consider the effects of mold and mildew over time. Mold and mildew can thrive on surface material, resulting in a dirty appearance and even making their way beneath the paint to the wood below. For this reason, it is prudent to consider the mildew-resistance of the paint you choose. Exterior paints available at hardware stores now include fungicides; ask your local retailer about which varieties offer the best protection.
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