The paint used on the exterior of a home or building is different than the paint used for interior painting. It is important to consider what type of paint you should use on the exterior of your Phoenix or Tucson home because Arizona has a harsher climate with extreme temperatures and intense UV radiation. This can cause paint to fade or crack, deteriorating much quicker than in states with a mild climate.

So, when you are ready to paint your home, one option you may want to consider is using an elastomeric paint for your exterior painting project. In this article, we’ll explore what elastomeric paint is, how it works, its pros and cons, and how to properly apply it for long-lasting exterior paint.

The short answer: Elastomeric paint is a thick, flexible exterior coating that stretches and contracts with the surface underneath. It bridges hairline cracks and resists water, which makes it a popular choice for stucco, concrete, and masonry. It costs more than standard exterior paint and is less breathable, so it isn’t the right choice for every surface.

What Is Elastomeric Paint?

Elastomeric paint is a high-build exterior coating that is extremely durable and water resistant. It is designed to protect exterior walls through its ability to expand and contract, which makes it an ideal product for surfaces such as stucco, brick, masonry, and concrete.

Unlike standard exterior paints, elastomeric coatings are thicker and more elastic. Depending on the formulation, elastomeric coatings can stretch to several times their original size without breaking. This high level of elasticity allows the coating to bridge small gaps and hairline cracks and accommodate structural movement and temperature-induced expansion. It is also applied much thicker than regular paint, typically several times the dry film thickness of a standard coat.

Pros and Cons of Elastomeric Paint

Benefits of Elastomeric Paint

Superior waterproofing: Elastomeric paint is excellent at preventing water from seeping into surfaces like stucco or brick, helping to reduce the risk of mold, mildew, and moisture damage.
Crack bridging and flexibility: Elastomeric coatings expand and contract to cover hairline cracks and imperfections, helping prevent further deterioration of the surface.
Durability: Elastomeric paint generally lasts longer than standard exterior paint. Its thickness and elasticity help it hold up better to sun, rain, wind, and temperature swings.
Energy efficiency: Light-colored elastomeric coatings reflect heat, which can help keep buildings cooler and reduce AC use during Arizona summers.
Ideal for harsh climates: Arizona’s extreme heat makes stucco expand and contract daily. Elastomeric paint moves with it, helping prevent the peeling paint and cracking that standard paint can develop.

Disadvantages of Elastomeric Paint

Higher cost: Elastomeric paint costs more per gallon than standard acrylic paint, and because it goes on thicker, a project needs more of it.
Less breathable: Elastomeric coatings are designed to keep water out, but they can also trap moisture that is already in a wall. If there’s an existing moisture problem, the coating can blister or bubble.
Not ideal for every surface: It is generally not recommended for most wood siding and trim, which need to breathe.
Harder to apply: Its thickness requires the right rollers or spray equipment and careful application to avoid runs and uneven coverage.
Longer drying time: Thick coats take longer to dry and cure, and humidity can slow the process further.
Hard to remove or switch away from: Once applied, elastomeric coatings are difficult to strip, and painting over them with a standard paint later takes proper prep.

When Should You Use Elastomeric Paint on Stucco?

Due to Arizona’s hot and dry climate, stucco homes are extremely common. Stucco is made from cement, sand, lime, and water, and it is an incredibly durable finish for the scorching summer heat. But stucco also expands and contracts with temperature changes, which leads to hairline cracks over time.

Elastomeric paint is a good choice for stucco when:

The stucco has hairline cracks that you want to bridge and seal.
The home gets heavy sun exposure and big daily temperature swings.
You want better protection against monsoon rain and moisture.
You want a longer-lasting finish and plan to stay in the home for years.

It may not be the best choice when:

There is an existing moisture problem in the wall that hasn’t been fixed.
The stucco is brand new and hasn’t fully cured. Follow the stucco manufacturer’s recommended cure time before painting.
The cracks are large or structural. These need proper stucco repair first, since elastomeric paint only bridges small cracks.

Wondering what it adds to your budget? See our breakdown of what it costs to paint a stucco home in Phoenix.

Phoenix stucco home exterior painted with elastomeric paint — This Phoenix exterior underwent major stucco repair prior to its full body transformation.
All cracks in the stucco were filled with elastomeric stucco patch or matching stucco material, using the correct texture to blend in as best as possible.

Can You Use Elastomeric Paint on Wood or Metal?

Metal: Yes, elastomeric coatings can be used on metal surfaces with the right preparation. The metal should be cleaned, any rust removed, and a compatible metal primer applied first so the coating adheres properly.

Wood: Generally, no. Wood expands, contracts, and holds moisture differently than masonry, and it needs to breathe. Because elastomeric paint is less breathable, it can trap moisture in wood and lead to peeling or rot. A quality exterior acrylic paint is usually the better choice for wood trim, fascia, and siding. Always check the product label for the surfaces a specific elastomeric paint is rated for.

Tips on Applying Elastomeric Paint

Elastomeric paint performs best on stucco, concrete, brick, and masonry, where it helps seal pores, prevent cracking, and block moisture. It can also be used on metal with the right primer.

Preparation Steps

To get the best results from elastomeric paint, preparation is key, and following the steps in the right order will provide the best outcome.

Clean the surface. Remove dirt, mold, chalky residue, and any loose paint to ensure proper adhesion.
Repair cracks and holes. Fill any significant cracks with an appropriate patch or sealant.
Make sure the surface is dry. Elastomeric paint should never be applied over damp surfaces.
Apply a primer if needed. Some surfaces require a primer to improve adhesion.

Proper Application and Maintenance

Because elastomeric paint is so thick, it is best applied with a high-build roller or sprayer for even coverage. Plan on at least two coats for maximum protection, and allow the manufacturer’s recommended drying time between coats. Avoid painting in extreme heat or high humidity, which can affect how the coating cures.

Once it’s on, elastomeric paint needs very little upkeep. Inspect the surface periodically for cracks or damage, and wash away dirt buildup with mild soap and water. For stubborn marks, see our tips for cleaning stucco stains. Learn more about caring for exterior paint, and plan to repaint every 10 to 15 years, depending on sun exposure.

Is Elastomeric Paint Right for Your Project?

Elastomeric coatings are a great choice for highly durable exterior painting that stands up to Arizona’s extreme climate. Our experienced exterior painters can help you decide whether elastomeric paint or a standard acrylic is the better fit for your home throughout the Phoenix Metro area and Southern Arizona.

Ready to protect your home with long-lasting, weather-resistant exterior paint? We understand the building materials in local homes and can help guide you to the right choice. Schedule a free consultation with Arizona Painting Company today.

Frequently Asked Questions

What are the cons of elastomeric paint?

The main drawbacks of elastomeric paint are its higher cost, lower breathability, longer drying time, and the need for careful application. It can trap existing moisture in a wall, and it is generally not recommended for most wood surfaces.

Why is elastomeric paint more costly?

Elastomeric paint costs more upfront than standard acrylic exterior paint, and it is applied thicker, so more product is needed. Its longer lifespan and reduced maintenance can make it a cost-effective choice over time. Standard exterior paints may need repainting every 5 to 7 years in Arizona, while elastomeric coatings can last 10 to 15 years.

What is the difference between acrylic and elastomeric paint?

Both are popular exterior options, but they serve different purposes. Elastomeric paint is thicker, more flexible, and more water resistant, which makes it ideal for stucco and concrete. Acrylic paint is thinner and more breathable, which makes it suitable for a wider range of surfaces, including wood.

Can you use elastomeric paint on interior walls?

It is possible in high-humidity areas like bathrooms and laundry rooms, but it is uncommon. Most interior walls are better served by a quality interior paint designed for that space.

Can you paint over elastomeric paint with regular paint?

Yes, but it takes proper prep. The surface needs to be clean and sound, and some situations call for a primer so the new paint bonds correctly. A professional painter can assess the existing coating before you switch products.

What is Elastomeric Paint? Benefits Uses & Application Tips