The interior of a concrete pool is a wear surface. Plaster, quartz, pebble — all of it is a comparatively thin layer of material bonded to a gunite shell, and it is under chemical and mechanical attack from the day it cures. It does not fail all at once. It fails slowly, and most owners live with a pool that has been telling them something is wrong for two or three seasons before they call anybody.
Knowing how to read those signals is the difference between a planned renovation you control and an emergency you do not. Here is what to look for, what actually shortens a finish's life, what a real resurface involves, and why tearing out an interior is the single best moment to fix everything else you have been putting off.
The warning signs
The surface scrapes your feet
This is the one everybody notices first, usually on the steps or the shallow-end floor. Fresh plaster is smooth. As calcium leaches out of it, the surface etches and roughens until it feels like sandpaper. If your kids are coming out of the pool with raw toes and scraped heels, the finish is not "a little worn." It is actively dissolving, and the rough profile also gives algae something to grip, which means you start fighting chemistry problems you never used to have.
Stains that will not come out
There is a difference between a stain you can brush or spot-treat and a stain that has migrated into the material. Plaster is porous. Metals, leaf tannins, and algae residue work their way in, and once they are in the matrix, no amount of scrubbing pulls them back out. Gray blotching, mottled dark patches, and rust-colored bleeding around rebar tie points are all signs the finish has lost its integrity, not just its looks.
Hollow spots and pop-offs
Tap around a suspicious area with the butt of a brush pole. If it rings hollow, the finish has debonded from the shell underneath. Delamination shows up as raised blisters or, eventually, as "pop-offs" — flakes of plaster that separate and lift, leaving a shallow crater with a hard edge. Once one section is delaminating, others generally are too, and patching a pop-off is a cosmetic band-aid on a bond failure.
Chronic water loss
Every pool in the Piedmont loses water to evaporation, especially in July. What is not normal is topping off every few days, or the level settling at the same spot regardless of weather. Rule out the obvious first — an autofill stuck open, a leaking backwash line, a bad skimmer throat — but a shell losing water through cracks and hairline checking is a structural conversation, not a maintenance one.
Exposed gunite
If you can see the gray, pebbly aggregate of the shell itself showing through, the finish is gone in that spot. There is no debate left. Water is now in direct contact with the structure, and the structure is what you are actually paying to protect.
What actually kills a finish early
Aggressive water chemistry
This is the number one cause, and it is not close. Plaster is calcium-based. Water that is low in pH, low in total alkalinity, or low in calcium hardness is "hungry" — it will pull calcium out of your interior finish to satisfy itself. Run a pool acidic for a couple of seasons and you will etch the plaster right off the walls. The flip side, water that is over-saturated, drops scale and calcium nodules instead. Both are chemistry failures, and both shorten the life of a finish that would otherwise have lasted much longer.
Chlorine tabs are a common culprit. Trichlor is acidic, and a tab sitting on the steps will burn a pale ring into the finish. Put tabs in a feeder, not on the plaster.
Letting the pool sit empty or unbalanced
An empty pool is a damaged pool waiting to happen. Plaster is meant to stay wet. Left dry and exposed to sun, it shrinks, checks, and crazes. Worse, in Guilford County's heavy clay, groundwater sits in the ground for a long time after a wet spell, and an empty shell will float if hydrostatic pressure is not relieved. Nobody should be draining a pool here casually.
The other version of this is the pool that gets neglected all winter, turns green, and then gets shocked back to life with a massive chemical dose in April. That swing stains and etches the interior every single time.
What a resurface actually involves
- Drain, with the groundwater managed. Hydrostatic relief valve open, weather watched, timing chosen so the shell is not sitting empty during a wet stretch.
- Chip out the old finish. Failed material comes off, not just the loose parts. Delaminated areas get taken back to sound substrate. This is loud, dusty, and unglamorous, and cutting corners here is why cheap resurfaces fail.
- Prep and bond coat. The shell gets cleaned, cracks and voids get addressed, and a bond coat goes on so the new finish has something to grab. Bond is everything. Skip it and you are buying pop-offs.
- Tile and coping, if they are being replaced. This happens now, while the pool is empty and the waterline is accessible.
- Apply the new finish. Plaster, quartz aggregate, or pebble, troweled by hand in a continuous pour so there are no cold joints.
- Expose or acid wash where appropriate. Pebble and quartz finishes get washed to expose the aggregate. The timing is a judgment call measured in hours, not days.
- Fill immediately and start the cure. A hose goes in the deep end on a cloth so it does not gouge the fresh surface, and it does not stop until the pool is full. Then roughly a month of daily brushing and disciplined chemistry.
Why this is the moment to do everything else
The pool is empty. Scaffolding, hoses, dumpsters, and crews are already there. Every project that requires an empty pool — waterline tile, coping, replacing tired light fixtures with LED, adding returns, converting to a nicheless light, cutting in a tanning ledge, upgrading main drain covers, addressing a cracked skimmer throat — is dramatically more sensible to do now than as a separate job in three years that requires draining the pool all over again.
The same logic applies to the equipment pad. If the pump is a single-speed relic, a resurface is when we would look at modern upgrades — variable-speed pumps, LED lighting, automation. Owners who resurface, then wish they had done the tile, end up paying twice.
How long a new finish should last
Generally speaking, standard white plaster lasts on the order of a decade, quartz goes longer, and pebble goes longest. Those are honest industry expectations, not promises, because service life depends heavily on water chemistry. We have seen well-maintained plaster outlive badly maintained pebble. The finish sets the ceiling. How you run the water decides whether you reach it.
If your pool is scraping feet, staining, or losing water, get eyes on it before the shell itself starts paying the price. Call (336) 471-0103 or request a design consultation, and we will walk the pool with you, tell you honestly how much life is left, and lay out what a proper pool renovation would involve.