Painting a damaged pool deck is not recommended if the substrate is crumbling, cracking, spalling, or otherwise actively deteriorating. Continuing deterioration will result in the paint also delaminating or flaking off the damaged surface. Minor damage such as chips or hairline cracks that are not actively deteriorating can often be repaired enough to paint over. A damaged pool deck with a lot of cracking and deterioration should be replaced for best results.

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.

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.

It is not always necessary to remove old stain before restaining a deck. If the previous stain is in good condition and is compatible with the new stain, you may be able to apply a new coat after thorough cleaning. However, if the old stain is in bad condition, flaking, or peeling, it is best to remove it completely to ensure an even surface and proper adhesion for the new coat. Staining over a damaged layer can lead to an uneven finish and poor penetration. For best results, test a small area first and consult the stain manufacturer's guidelines.