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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.

Wood stain does go bad, but it will last in the can for between three and six years, provided you use proper storage techniques. Storing wood stain in open containers or in extremely low or high temperatures will cause your wood stain to become unusable much more quickly. Water- and latex-based wood stains typically last for just two to four years, while oil-based wood stains can last for three to six years.

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.

Wood stain is typically dry to the touch within 6 to 12 hours, but it is not fully cured at this point. You should wait at least 24 hours before applying a second coat or a protective finish. For surfaces like decks, avoid walking on them for at least 24 to 48 hours, and wait even longer before placing furniture. The full curing process can take from 24 hours to one week, depending on the type of stain. Factors like high humidity and cold temperatures can extend drying and curing times, so it's wise to allow for extra time in these conditions.