Choosing the right product involves understanding deck material, desired finish, and local weather conditions. Opt for high-quality, weatherproof formulations ensuring long-term durability and appearance retention.

The longevity of paint on wood depends on factors like the quality of the paint, surface preparation, exposure to elements, and maintenance. Exterior paint on wood surfaces can last 5 to 15 years or more with proper care and maintenance. Interior paint tends to have a longer life span, often 10 years or more. Regular cleaning, touch-ups, and addressing any issues like peeling or cracking can extend the life of the paint. 

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.

Deciding whether to stain or paint a pool deck depends on your budget, desired look, and the deck's material. Both options can work. Paint offers a wider variety of color options, provides excellent water resistance, and can last longer. However, it requires a primer and can eventually fade or peel. Stain is often cheaper, easier to apply, and penetrates the wood for a more natural look and longer-lasting finish. It also has great water resistance. The downsides are fewer color options and the need for a sealant. The choice can also depend on the deck material; for example, staining may be a better option for concrete as it bonds well and lasts longer than paint.