Yes, you can and should paint or stain pressure-treated wood to help prevent the boards from cracking. However, you must wait for the wood to dry out completely before applying any finish. Freshly treated wood can take weeks or even months to dry; a common recommendation is to wait three to six months. To check if the wood is ready, perform a simple water test: drip some water onto the surface. If the water beads up, the wood is still too wet and needs more time to dry. If the wood absorbs the water, it is dry enough to be painted or stained. You can proceed with building your deck or fence while the wood is still wet, but you will need to wait to apply the paint or stain.

Exterior paints contain more volatile organic compounds, or VOCs, making them dangerous when used indoors. Without the free ventilation of the great outdoors, it can take longer for the fumes to dissipate than interior paint. While you may notice the smell lessening more quickly, you should be wary of paint fumes inside for 48 to 72 hours after it dries.

Yes, it is important to wash your deck before painting to ensure the paint applies well and adheres properly. While you don't have to use a pressure washer, it is one of the most efficient cleaning methods. Pressure washing can quickly remove dirt, wood fibers, and flaked paint, getting deeper into the wood than manual scrubbing. You can also clean the deck with a stiff broom and a cleaning solution. Regardless of the method, a clean surface is essential for good paint adhesion. Make sure the deck is completely dry before applying any paint.

You can refresh a painted deck by either giving it a thorough cleaning or refinishing the deck altogether. Chipped or faded paint, as well as extensive damage, often calls for a new finish. To do this, remove the original coat of paint with a sander and add either a new coat of paint or a stain to protect the wood below.