What Paint Is Best For Treated Wood?
QUICK ANSWER
Use exterior latex paint over a quality exterior primer for treated wood. Wait until the wood is fully dry before painting (often 6 months to a year for newly treated lumber), since moisture in the wood causes paint to peel. Test by sprinkling water; if it absorbs, the wood is ready.
Painting pressure treated wood is doable but requires patience. The treatment chemicals leave the wood saturated with moisture and preservatives that prevent paint from bonding. Skipping the drying step is the most common reason newly painted treated lumber peels within months. Here is the right timeline, the right paint, and how to know when the wood is actually ready.
Can you paint pressure treated wood?
Yes, but only after the wood has fully dried, which typically takes 6 months to a year for newly purchased treated lumber. The pressure treatment process forces preservative chemicals deep into the wood along with significant moisture. Until that moisture works its way out, paint cannot bond properly to the surface. Older treated lumber that has been in place for years or decades is generally ready for paint without additional waiting, as long as it is structurally sound.
How long do you wait before painting?
Test for dryness rather than counting months. Sprinkle water on the wood surface. If the water absorbs into the wood within a few minutes, the wood is dry enough to paint. If the water beads up and sits on the surface, the wood still contains too much moisture and preservative residue; wait longer. Most newly treated lumber takes 6 months to a year to reach the dry state. Lumber stored under cover dries slower than lumber exposed to sun and wind. Test before each painting project rather than assuming.
What paint should you use?
Exterior latex paint (acrylic latex) over a quality exterior primer is the standard recommendation. Use a stain-blocking primer designed for exterior use (Zinsser Bulls Eye 1-2-3, Kilz Premium Exterior). Two coats of paint provide better coverage and longer life than one heavy coat. For decks specifically, use a deck paint or solid color deck stain rather than wall paint; these are formulated for foot traffic and weather. Oil-based primer plus latex topcoat is the most durable combination for high-exposure treated wood.
What prep is required?
Clean the wood thoroughly to remove dirt, pollen, and any surface mildew. A pressure washer set to medium works well; let the wood dry for 48 hours after washing. Sand any rough spots smooth, paying attention to where boards meet. Replace any badly weathered boards. Apply primer to the cleaned dry surface, let cure 24 hours, then paint. Do not paint when temperatures are below 50°F or above 90°F, when rain is in the forecast, or in direct sun on hot days that will skin over the paint before it can level.
Treated wood paints well after it dries, which means waiting 6 months to a year for newly treated lumber. Test with water sprinkles to confirm readiness. Use exterior latex paint over a quality exterior primer. Two thin coats of each beat one thick coat. Clean thoroughly, prep correctly, avoid temperature extremes. Done right, exterior treated wood paint lasts 5 to 10 years before refresh.
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