“Plaster,” “quartz” and “pebble” are useful shopping categories, but all three commonly describe cementitious pool finishes. The meaningful differences are the aggregate exposed at the surface, texture, color behavior, installation method, manufacturer system and how much of the cement matrix remains directly exposed to swimmer contact and water chemistry.
Start With What the Finish Is
| Finish category | What is generally at the surface | Homeowner tradeoff |
|---|---|---|
| Traditional plaster | Hard-troweled cementitious finish with fine aggregate. | Classic smooth feel and usually lower initial cost; appearance and chemistry sensitivity can be more noticeable. |
| Quartz aggregate | Factory- or field-blended cementitious finish containing colored or natural quartz aggregate. | More aggregate character and often more texture/color options; exact product matters. |
| Pebble / exposed aggregate | Cement binder is intentionally removed/exposed at the face to reveal larger pebble or aggregate. | Distinct texture and appearance; aggregate size/exposure strongly affects feel. |
SGM, for example, describes Diamond Brite as a factory-blended quartz-aggregate finish with fortified white Portland cement. Pebble Technology likewise explains that its aggregate finishes combine pebbles with a cementitious matrix. These are not plastic liners or thick “paint” films.
Do Not Buy a Lifespan Number Without the Conditions
Advertisements often attach a single service-life number to each category. That can be useful as rough market context, but the National Plasterers Council emphasizes that finish longevity depends heavily on proper startup and ongoing water chemistry. A premium aggregate does not make low pH, low calcium hardness, scale-forming water or poor workmanship irrelevant.
Texture Is a Real Design Choice
NPC distinguishes smooth hard-troweled finishes from exposed-aggregate texture. If swimmer comfort matters, do not judge texture from a dry showroom chip alone. Ask to feel a cured wet sample or an actual completed pool using the exact finish family and aggregate size.
Color Is Not a Paint Chip
Cementitious finishes can show shading and mottling, and the apparent water color changes with pool depth, sunlight, surroundings and water condition. PebbleTec specifically cautions that samples and photographs cannot guarantee the final water color and recommends allowing the initial curing period before judging it.
Questions for the Quote
- What exact manufacturer and finish name is being installed?
- Is it smooth plaster, quartz aggregate, exposed pebble or another proprietary system?
- What prep is required on the old shell?
- Who is responsible for fill and startup?
- What natural variation is excluded from the appearance warranty?
- What does the warranty say about chemistry, staining, mottling and delamination?