How to Paint a Concrete Pool? | A Full Step-by-Step

For the full breakdown, see our best Concrete Pool Paint guide.

A fresh coat of paint transforms a tired concrete pool into a backyard centerpiece. But skipping any critical prep step — like the acid etch or the full dry time — guarantees peeling and bubbling within a season. This guide walks through every stage, from draining to refilling, so your new finish lasts years instead of months.

Prep Work: Drain, Clean, and Inspect

Start by draining the pool completely. Don’t skip the cleaning — use a pressure washer to strip away old paint, algae, and debris. Next, sand the entire surface. The goal is a dull, clean surface that paint can grip. Wipe all dust away with a damp cloth.

Now inspect every inch of concrete. Deep cracks need grinding out and filling with hydraulic cement. Shallow defects under 10 mm can be filled with epoxy filler. Minor hairline cracks work fine with liquid cement crack filler. Fixing these before painting prevents the new coat from masking structural weaknesses.

Acid Etch — The Step Beginners Rush

New concrete must be etched for paint to bond. Scrub walls and floor with a stiff-bristle brush, letting it work for 3–4 minutes. Never let the acid dry on the surface. If your pool was previously painted and the old paint is sound, you may skip the etch and just sand and clean — but when in doubt, etch.

Neutralize immediately with a tri-sodium phosphate (TSP) solution, then rinse thoroughly with fresh water. Safety note: Wear a respirator, gloves, and full paint clothes when handling muriatic acid. Use a plastic watering can — never metal — for application. The fumes alone demand good ventilation.

Allow the pool to dry completely. In warm weather that means at least 24 hours; in cool weather, plan on 3–4 days. Paint applied to a damp surface will fail.

Paint Selection and Application

Two-part epoxy offers the strongest adhesion and chlorine resistance — it’s the gold standard for concrete pools. Waterborne (acrylic) paint is less toxic and easier to apply but less durable than epoxy. Either way, if the paint instructions call for primer, apply it before the color coats.

For two-part epoxy, mix Part A and Part B for a full 6–10 minutes. Mix all gallons in one large container for uniform color. “Cut in” edges and corners with a brush first, then roll the first coat starting from the deep end toward the shallow end. Work in a single day so the coat cures as one layer. Let it cure 24 hours before the second coat. If you wait longer than the manufacturer’s recoat window, abrade the surface back to a dull finish before applying coat two.

Plan your painting window carefully. Temperatures must stay between 50°F and 90°F. You need four consecutive dry, warm days for painting and at least one rain-free week for curing. Avoid painting in direct sunlight — follow the sun around the pool, painting shaded areas first. For exterior pools in the US, summer is ideal. Indoor pools may need up to 14 days of cure time.

Curing, Refill, and Common Mistakes

After the second coat, let the paint cure before adding water. In summer, wait 7 days; in winter, give it 14 days. Indoor pools also lean toward the 14-day mark. When you do refill, hold off on adding any pool chemicals for 3–5 more days.

The most common failure point is rushing the dry stage. Painting over a damp shell guarantees adhesion failure. Other frequent mistakes include skipping the acid etch on new concrete, not mixing two-part epoxy long enough (set a timer for that full 6–10 minutes), and letting rain hit the finish during drying. If rain does land on uncured paint, you’ll have to abrade the surface dull and reapply. Do not cover the wet paint with a tarp to dodge rain — it traps moisture and damages the cure.