No, it is not okay to paint over rotted wood. Painting over rotted wood will not address the underlying issue and can trap moisture, leading to further decay. Properly addressing the rotted wood by removing and replacing or repairing the damaged areas is necessary before you can even consider painting.

You don’t necessarily have to remove all the old paint before repainting your deck, but it’s best to remove as much as possible to ensure a smooth and long-lasting finish. Prioritize scraping off loose, peeling, or flaking paint, and sand down rough areas to create a smooth surface for the new paint to bond with.

Limewash and whitewash are two techniques used to give brick a light, matte finish, but they differ in composition, application, and permanence. The best choice depends on your aesthetic goals and the specific surface.

Composition

• Limewash: A natural and environmentally friendly option made from limestone, water, and sometimes pigments. It is breathable and soaks into porous surfaces like brick.

• Whitewash: Traditionally made from lime, water, chalk, and binders, but a similar look can be achieved with watered-down white paint. It is paint-based and sits on top of the surface.

Appearance and Finish

• Limewash: Provides a natural, textured appearance that allows the brick's character to show through. It offers a more traditional finish.

• Whitewash: Creates a softer, more opaque finish, often used for a rustic or shabby-chic style.

Application and Permanence

• Limewash: Is semi-permanent and can be removed, making it a good choice if you might want to change the look in the future. It requires more skill to apply and cannot be used on previously painted brick.

• Whitewash: Is a more permanent solution. It is more forgiving to apply and can be used on painted brick. However, because it sits on the surface, it can trap moisture.

Ultimately, if you want a breathable, natural, and reversible finish for unpainted brick, limewash is a great option. If you need a more permanent, opaque coating that can be applied over painted surfaces, whitewash is the better choice. Whitewashing may also be more economical, costing approximately $1.40 to $4.20 per square foot.

Painted decks typically require a new coat about once every ten years. In between new coats, it's best to maintain your deck by regularly removing debris, washing it down with non-abrasive cleaners, and staying ahead of structural issues, such as loose boards and rotting wood. In some cases, painting a small section of your deck affected by damage or the sun can lower your costs and workload.