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 should seal your deck every one to two years, but you’ll also need to clean and repair your wood deck throughout the seasons. You may want to hire a local house cleaning service to sweep and clean the deck thoroughly. These cleaning services cost around $50 per hour.

Inspect your deck at least once a year, and if you notice any damage or rot, expect to spend about $10 to $50 for simple DIY fixes or about $2,000 for professional repairs on more extensive damage.

The need for a topcoat on a painted deck depends on various factors, primarily the type of paint used and your desired level of protection. Many premium deck paint formulations are self-sealing, eliminating the necessity for an additional topcoat. These paints often have built-in additives that substantially protect against moisture, UV rays, and everyday wear and tear.

Whether you can paint over your existing paint depends on what’s on there. Most of the time, you’ll want to sand down or scrape off the paint that’s currently coating your surface. Epoxy paint, for example, won’t let new paint stick to the surface. Latex paint is more forgiving and will accept a new coat, but a primer is recommended if you’re switching colors.