The good news about treated wood is that it's already resistant to weather, insects and rot --- which is the whole purpose of treating lumber in the first place. You only need to paint it if you want to change its appearance. Unfortunately, the same chemicals that make treated wood resist the elements also make it resistant to being painted. You need to account, too, for the fact that some of these chemicals will bleed out into the paint over time.
Instructions
1. Set out the treated lumber and allow it to dry as much as possible given the time frame of your project. Every day you let it dry means there will be less leaching of the treatment solution out into your paint job.
2. Lay out a drop cloth beneath the area you want to paint.
3. Apply a coat of oil-based primer rated for exterior woods. Use your paintbrush in long, even strokes. Don't press down on the brush to squeeze out primer as it starts to dry. Rather, reload early and often.
4. Wait for the primer to dry, then add a second coat. Two coats of primer will help resist the chemical bleeding from the treated lumber.
5. Wait for the second coat to dry. Apply your first coat of oil-based exterior paint over the primer. Use the same painting techniques you did with the primer.
6. Apply a second and third coat of paint, using the same methods and techniques you did with previous coats.
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