A pool finish has a biography. It begins as a wet, gray slurry troweled over bare shell, spends its first month in a delicate and surprisingly important stage, settles into years of steady service and eventually shows its age in ways you can learn to read. Most owners only meet the surface at the very start and the very end, and miss everything in between. The crew at Blue Pool Plastering sees all of the chapters, and this piece walks through them in order, so you know what is happening to your pool and why it matters.

Chapter One: The Day It Goes In

Plastering day is fast and unforgiving. The shell has been prepared, tile and fittings are set, and the mixture of cement, aggregate and water goes on in a continuous push. Finishers have a limited window to spread it evenly and trowel it smooth before it begins to set, and they cannot stop halfway for a break. A pool plastered in several disconnected sections can show seams and color differences that never fully go away.

The mix itself matters. Water content, the quality of the cement and aggregate, and the weather on the day all influence how the surface cures. Too much water makes plaster weaker and more likely to show mottling, so experienced crews watch it closely. Whether the finish is a classic white plaster, a colored one or an exposed aggregate blend, the same principle applies: what happens in those first hours sets the ceiling for how well the surface can perform.

Chapter Two: The Fragile Month

Here is the part most owners do not expect. Once the pool is plastered, the clock starts on the cure, and the first weeks are when the surface is most vulnerable. The pool should be filled promptly and continuously, without stopping partway, since a visible waterline ring can form where filling paused. After filling, the chemistry is balanced carefully and the surface is brushed on a schedule, which clears away cement dust that would otherwise settle and leave rough, discolored patches.

During this period, the water chemistry needs to be kept in a gentle range rather than pushed hard in either direction. Water that is too aggressive can etch a young surface, while water that deposits scale can leave rough crust. The National Plasterers Council publishes startup guidance for new plaster, and its resources for pool owners and builders are a reliable reference for the steps that protect a new finish. Follow the instructions your installer gives you, and ask for them in writing if they have not been provided.

Resist the urge to skip the brushing or to shock the pool heavily in the first days. A surface that is treated patiently in this stretch tends to stay smoother and brighter for years.

Chapter Three: The Quiet Middle Years

If the first month goes well, most pools enter a long and mostly uneventful stretch. The surface hardens, the color settles into its permanent shade and routine care takes over. This is where owners shape the outcome without realizing it.

Chemistry is the main character. Calcium hardness, alkalinity and pH interact to determine whether the water is gently balanced, corrosive or scale-forming. Corrosive water slowly dissolves the surface, leaving it rough and exposing aggregate, while scale-forming water leaves white, crusty deposits. Neither happens suddenly. Both happen through months of small imbalances, which is why regular testing is more valuable than occasional heroic corrections.

Other habits matter too. Brushing prevents algae from taking hold in porous spots. Keeping leaves and debris off the floor avoids stains that can become permanent. Chemicals added directly to the water in concentrated form, such as undissolved granules resting on the floor, can bleach or etch a spot. Dissolving and dispersing them properly protects the finish.

Chapter Four: The Signs of Aging

Every plaster surface eventually changes, and the early signs are worth learning.

A rough texture underfoot, especially in the shallow end and on steps, often means the surface has worn thin. Staining and dullness that no longer brush away suggest the top layer is wearing down. Small cracks may appear, some of them cosmetic and some signaling movement in the shell. Hollow sounds when tapped gently can point to delaminated areas where the plaster has lost its bond. Persistent water loss, rust streaks or discoloration near fittings deserve a closer look as well.

None of these means the pool is finished, but together they tell a story. Cosmetic roughness is a very different matter from a structural crack or a failing bond, and a qualified professional can tell them apart.

Chapter Five: Repair or Resurface

Small problems can often be handled with targeted repairs. Chipped areas can be patched and hairline cracks can be sealed, though matching the color of aged plaster is notoriously difficult, so do not be surprised if a patch remains visible.

When roughness, staining and delamination are widespread, resurfacing makes more sense. That usually involves draining the pool, removing or preparing the old surface and applying a new finish, and it is an ideal moment to address other items like tile, coping and fittings while the pool is empty. Draining carries its own cautions, since an empty pool can be damaged by groundwater pressure in some locations, so this decision should be guided by someone who knows the site. Local rules may also apply to how pool water is discharged.

Choosing the Next Chapter

When the time comes, the finish you pick will shape the next stretch of the pool’s life. Traditional plaster is smooth and economical but tends to wear sooner. Aggregate finishes using pebbles or glass beads are more durable and resist staining and etching, at a higher price. Texture, color and comfort underfoot differ among them, and the right choice depends on your budget, your water chemistry and how you use the pool.

Ask any plasterer you consider to explain their process for preparation, mixing, application and startup, to describe what the warranty covers and what could void it, and to show completed pools that are a few years old. The biography of a pool surface is written over a decade or more, and the best time to think about the later chapters is before the first one begins.