Introduction
Is your concrete pool showing signs of age—like rough surfaces, cracks, or discoloration? Resurfacing might be the solution. In this complete step-by-step guide on how to resurface a concrete pool, you’ll learn how to restore your pool’s smoothness, durability, and appearance, giving it a fresh, new finish and extending its lifespan by years.
Why Resurfacing a Concrete Pool Matters
Over time, a concrete (gunite or shotcrete) pool’s surface deteriorates due to:
- Harsh pool chemicals
- UV exposure
- Freeze-thaw cycles
- Water imbalances
- General wear and tear
Common signs that it’s time to resurface include:
- Cracking or flaking (known as spalling)
- Staining or discoloration
- Rough or sharp patches
- Water loss due to surface damage
Resurfacing not only improves your pool’s appearance but also restores safety, comfort, and proper water retention.
Step-by-Step Guide to Resurfacing a Concrete Pool
Step 1: Drain the Pool Completely
Turn off the pool pump and filtration system. Using a submersible pump, drain the pool water completely until the floor is dry and accessible.
Caution: Never leave a drained pool unattended for long periods—concrete shells can shift or crack without water weight.
Step 2: Inspect the Pool Surface
Examine the entire surface for cracks, chips, or hollow spots (areas where the surface may have detached from the concrete base).
Mark these areas for repair. If structural damage is severe, consult a pool contractor before continuing.
Step 3: Remove the Old Finish
Use a grinder, chisel, or pneumatic tool to remove the old surface layer (plaster, paint, or coating) from the pool. You want to expose the raw concrete shell underneath.
- For plaster pools: Chip away the old plaster down to a solid base.
- For painted surfaces: Use a grinder to remove all loose or flaking paint.
Pool Owner Tip: Rent a concrete grinder or scarifier for larger jobs—it saves time and delivers a more even surface.
Step 4: Clean the Pool Shell Thoroughly
Once the old surface is removed, clean the entire pool with:
- Trisodium Phosphate (TSP) or pool degreaser to remove oils and residues
- A pressure washer to rinse off debris
- A strong vacuum to remove dust and grit
Allow the pool to dry completely before proceeding to the next step.
Step 5: Repair Cracks and Hollow Spots
Use hydraulic cement or a pool-grade concrete patch to fill:
- Visible cracks (open and clean them first for better adhesion)
- Any hollow-sounding areas (chisel out loose material and fill)
Let all patches cure fully per manufacturer instructions.
Pro Tip: For spider cracks or hairline fractures, apply bonding agent or epoxy to strengthen the surface before resurfacing.
Step 6: Apply Bonding Agent
To help the new surface layer adhere to the old shell, apply a bonding agent across the entire pool surface using a roller or brush.
Let it become tacky but not dry—timing is crucial for proper adhesion.
Step 7: Mix and Apply the New Surface Material
There are three main resurfacing materials for concrete pools:
- Plaster (Marcite): Traditional and affordable; lasts 7–10 years.
- Pebble Finish: Durable and textured; lasts 15–20 years.
- Quartz Finish: Offers smoothness with enhanced strength and color.
Application Process:
- Mix the resurfacing material according to the product label.
- Start at the deep end and trowel the material evenly across the walls and floor.
- Apply a consistent thickness (usually 3/8” to ½”).
- Use a pool trowel to smooth the finish and remove air pockets.
Pool Owner Tip: Work in small sections and keep the surface damp during application to prevent premature drying.
Step 8: Cure the Surface
Let the newly applied surface cure for at least 3 to 7 days, depending on the material and weather conditions.
- Keep the surface damp by lightly misting with water daily.
- Avoid walking or placing any objects in the pool during this time.
Important: Do not refill the pool until curing is complete and the surface has hardened.
Step 9: Refill and Balance the Pool Water
Once fully cured:
- Refill the pool gradually with clean water.
- Do not stop the water halfway—stopping during refilling can cause water lines or surface discoloration.
- As the pool fills, begin monitoring the water chemistry.
- Balance pH, alkalinity, and calcium hardness to prevent staining or etching of the new surface.
Step 10: Brush the Surface and Monitor
For the first two weeks:
- Brush the pool walls and floor daily to remove plaster dust or residue.
- Run the pump 24/7 to circulate water.
- Avoid swimming for at least 7 days or until water is balanced and clear.
Common Mistakes to Avoid
- Rushing the Prep Work
Poor surface preparation leads to peeling or delamination. - Improper Mixing or Application
Follow manufacturer instructions exactly—mistakes reduce durability and cause uneven texture. - Skipping the Bonding Agent
This leads to poor adhesion and premature failure of the new surface. - Filling Too Early
Always wait for full curing—filling too soon can damage the finish. - Neglecting Water Chemistry After Refill
Improper balance can etch or discolor the new surface quickly.
Extra Tips & Pool Hacks
- Resurface in Mild Weather: Spring or fall offers ideal temperatures for curing.
- Hire Help for Large Pools: Resurfacing is labor-intensive—consider hiring a pro if the pool is over 15,000 gallons.
- Consider Color Finishes: Quartz and pebble finishes come in a variety of colors to give your pool a luxury look.
- Seal After Curing: Applying a pool-safe sealant can add extra protection and prolong the surface life.
Want to maintain your new surface? Check out our guide on [how to balance pH levels in your pool] to protect it long term.
Conclusion
Resurfacing a concrete pool is a big job—but with the right tools, preparation, and patience, it’s one you can tackle successfully. The result is a smooth, beautiful, and durable surface that adds value and enjoyment to your backyard pool for years to come.
✅ Bookmark this guide for your next pool restoration project or share it with a fellow pool owner!