Painting outdoor concrete can help protect and enhance the appearance of driveways, patios, walkways, pool decks, and other exterior concrete surfaces. With the right preparations and techniques, you can achieve a fresh new look for your outdoor concrete that will last for years. This comprehensive guide covers everything you need to know to successfully paint concrete outdoors.
Clean and Prepare the Concrete Surface
Proper cleaning and surface preparation are crucial first steps before painting outdoor concrete. Here’s how to get your concrete ready for a new coat of paint:
Remove Dirt, Grease, and Existing Paint
Use a stiff brush and concrete degreaser to scrub away built-up dirt, oil stains, and other contaminants. You may need a pressure washer for large or heavily soiled areas. Completely remove any existing paints or sealers by sanding or using a paint stripper. Get the concrete as clean as possible to ensure the new paint adheres properly.
Repair Cracks and Holes
Inspect the concrete and use a concrete patch compound to fill any cracks, chips, spalls, or holes. Scrape and sand the repairs smooth once dry. Addressing flaws beforehand gives the paint job a seamless finished look.
Etch the Surface
Etching opens up pores in the concrete to allow the new paint to absorb and bond. Mix up a concrete etching solution according to the product instructions and apply it with a pump sprayer. Let it sit for 5-10 minutes before thoroughly rinsing. Wear gloves and eye protection when etching.
Allow Proper Dry Time
Let the surface dry completely after cleaning and etching. Check for any remaining dampness, which can interfere with paint adhesion. Wait for at least 24 hours of dry weather before painting.
Choose the Right Paint and Supplies
Picking products designed specifically for exterior concrete will provide the most durable, long-lasting results:
- Concrete paint – Acrylic latex paints are a good choice for outdoor concrete painting. Avoid exterior house paints, which may not adhere as well.
- Primer – Specially formulated acrylic or epoxy primers help the topcoat stick to the concrete. Always prime before painting.
- Anti-slip additive – Adding a textured grit to the paint creates traction to prevent slipping on pool decks and steps.
- Concrete sealer – Apply a clear acrylic sealer after painting to protect the finish and help it last longer.
- Paintbrush – Use a stiff nylon bristle brush for applying paint and primer.
- Paint roller – A heavy nap 3/4″ roller makes quick work of covering large areas.
- Paint tray – Use a deep roller tray to hold ample paint for coating concrete surfaces.
Apply Primer and Paint
With the right supplies in hand, follow these key steps for painting the concrete:
Prime the Surface
Use a brush or roller to apply a uniform coat of exterior concrete primer. Cover the entire surface, working the primer into the concrete pores. Allow the primer to fully dry per the manufacturer’s directions before painting.
Apply the First Coat
Using a brush, cut-in along edges, corners, and trim with the concrete paint color you’ve chosen. Then use the roller to fill in the main concrete area with an even coat of paint. Work in small sections to avoid lap marks and only coat areas you can reach without walking on wet paint.
Add Second Coat and Touch-Ups
After 4-6 hours of drying time, apply a second coat to build coverage and color intensity. Spot paint any thin or missed areas. Allow the paint to cure for 24-48 hours before walking on the painted surface or adding any sealers or anti-slip treatments.
Painting Tips and Techniques
Follow these pointers to get professional quality results painting outdoor concrete:
- Only apply paint when temperatures are between 50-90°F and the concrete is completely dry. Avoid painting in direct sunlight or if rain is expected within 24 hours.
- Divide large areas like driveways and patios into smaller sections using tarps or drop cloths. Work in one section at a time.
- Use edging paint brushes for sharp lines along walls, fences, landscaping and other edges.
- Watch for natural breaks in the concrete, like expansion joints, to serve as end points for painted sections.
- Apply paint thicker over patched cracks and repairs to build extra coverage.
- Mix in anti-slip additive on final coat for pool decks, steps, and ramps to help prevent falls when wet.
- For best durability, reapply concrete paint every 1-3 years or as soon as you notice fading or wear.
Frequently Asked Questions
Here are answers to some common questions about painting outdoor concrete surfaces:
Can I use regular house paint on outdoor concrete?
No, regular exterior house paints are not formulated to properly adhere and endure on concrete surfaces. Only use heavy-duty masonry paints designed specifically for concrete.
What kind of primer do I need?
Look for primers made for exterior concrete, such as those with acrylic or epoxy resins designed to penetrate and bind to concrete. Always prime before painting.
How long does painted concrete last?
With proper surface prep and application, painted concrete can last 1-3 years before needing fresh coats of paint. Use concrete sealers to maximize durability. High traffic areas may need more frequent repainting.
Should I etch the concrete before painting?
Yes, etching the surface is highly recommended so the paint can gain the best adhesion on bare concrete. Use a diluted masonry etching solution before priming.
Can I paint over existing concrete sealers?
No, you’ll need to completely remove old sealers and paint with a chemical stripper or by sanding thoroughly before applying fresh paint. New paint won’t bond properly to sealed concrete.
What kind of brushes and rollers should I use?
Use high-quality nylon or polyester bristle brushes and thick 3/4” nap rollers designed for smooth masonry surfaces. Avoid foam rollers, which don’t provide enough texture for concrete.
Should I add sand or grit to the final coat?
Yes, mixing in anti-slip additive creates traction for safety on pool decks, steps, and ramps. Add it to the final paint coat per the manufacturer’s instructions.
How long should I wait before sealing painted concrete?
Allow the paint to cure for at least 24-48 hours before applying any concrete sealers. The paint needs time to harden properly so the sealer bonds effectively.
Conclusion
Painting outdoor concrete requires careful preparation and the right methods to ensure it adheres and withstands the elements. By following the techniques outlined and using high-quality concrete painting products, you can give your exterior surfaces a beautifully renewed look that lasts. Pay special attention to proper cleaning, repairing flaws, priming, and allowing adequate drying time between steps. With some time and care taken, a fresh paint job can rejuvenate worn concrete for years of renewed curb appeal and protection.