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The best temperature to paint a pool deck is between 50 and 90 degrees Fahrenheit, because many paints and sealers require temperatures warm enough for the chemical reaction to take place for proper curing. The paint should not be allowed to freeze, and temperatures above 90 degrees can cause the paint to dry too quickly, also preventing the chemical reaction from following through to completion.

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.

Limewash and whitewash do not harm surfaces if you apply them correctly. Use on non-suitable surfaces can cause issues. For instance, applying limewash or whitewash to surfaces with existing sealants or incompatible materials may lead to poor adhesion or flaking. Also, harsh cleaning agents on limewashed or whitewashed surfaces can damage the finish. Proper preparation, application, and maintenance ensure that limewash and whitewash do not harm surfaces.

The best way to protect a deck is to prevent damage from UV light, water, mold, mildew, insects, and abrasive cleaning methods. Sweep regularly to prevent debris that hides bugs and traps moisture that can result in mold or mildew growth. Use a deck cleaner once a year to remove algae, mold, and mildew. Avoid using pressure washers on high, as they can damage the wood. Applying a deck sealant can protect the wood from UV and water damage, and adding shade can also reduce sunlight damage.