Elastomeric Paint: The Essential Guide
Minor cracks, shifting walls, and moisture infiltration can pose serious challenges for homeowners—especially when they lead to peeling paint or persistent stains. Elastomeric paint offers a way to keep exteriors (and occasionally interiors) protected from these headaches. By forming a flexible, long-lasting barrier, it helps walls resist cracking, water intrusion, and frequent wear-and-tear. In this guide, we’ll look into what elastomeric paint is, see how a product like Loxon XP fits into the picture, and break down whether you can paint over an existing elastomeric coating.
1. Why Elastomeric Paint Stands Out
1.1. A Shield Against Movement and Moisture
Few things damage a paint job faster than the natural expansion and contraction of walls due to temperature swings. Standard paints often flake or crack when the surface moves even slightly. Elastomeric paint, on the other hand, is formulated with flexible polymers that can accommodate small shifts without tearing. This property is especially appealing for stucco, concrete, and masonry, which are prone to hairline fissures.
Adding to its appeal, elastomeric paint forms a thicker layer than many standard exterior coatings. This high-build characteristic helps block moisture, rain, and humidity from seeping into minuscule gaps. Thus, your home’s exterior remains not only more aesthetically consistent but also better shielded from mold or deeper structural problems.
1.2. Where It’s Typically Used
- Stucco: Stucco walls frequently develop fine cracks; elastomeric paint can bridge those and prevent further spread.
- Concrete: Foundations, basement walls, and blocks are prime examples of surfaces that benefit from a thicker, flexible coating.
- Masonry: Bricks and mortar joints can absorb water, making them candidates for elastomeric solutions.
- Occasional Interiors: Some damp basements or moisture-heavy areas might call for this type of coating, though it’s less common indoors.
2. What Is Elastomeric Paint?
Question: “What is elastomeric paint?”
Elastomeric paint is a specialized, rubber-like coating typically used on exterior walls. It’s richer in certain polymers compared to standard acrylic or latex paints, giving it the unique ability to stretch and recoil without fracturing. Once cured, it behaves like a tight yet flexible membrane that can expand or contract in response to temperature shifts.
2.1. Key Traits
- Flexibility
- The paint can handle slight structural movement without cracking.
- Thicker Film
- Often applied in heavier coats—sometimes two or more layers—to achieve the right level of protection.
- Moisture Resistance
- The thicker film helps keep out rain, snow, or high humidity.
- Vapor Permeability
- Most elastomeric paints still let water vapor escape from the wall, which reduces the risk of trapped moisture.
2.2. Typical Benefits
- Enhanced Durability: Less frequent touch-ups or repainting.
- Crack-Bridging Abilities: Ideal for hairline issues on stucco or concrete.
- Protective Barrier: Helps avert deeper water damage that could affect a wall’s internal structure.
3. Is Loxon XP an Elastomeric Paint?
Question: “Is Loxon XP an elastomeric paint?”
Loxon XP, produced by Sherwin-Williams, often comes up in discussions about elastomeric coatings. While product terminology varies by brand, most painting professionals consider Loxon XP to be within the elastomeric category or at least very close. It’s crafted for use on masonry, stucco, and concrete, offering robust crack-bridging capabilities alongside water repellency.
3.1. Defining Elastomeric
A paint typically qualifies as “elastomeric” if it has a measurable elongation rating. In other words, the dried coating can stretch a certain percentage beyond its original form without rupturing. The higher this rating, the more movement the paint can absorb.
3.2. Loxon XP Specifics
- Crack Resistance: Advertised for minor cracks in masonry or stucco, similar to many elastomeric formulations.
- Water Shedding: Helps repel wind-driven rain, reducing the risk of mildew or mold.
- Breathable: Despite its protective qualities, it generally allows underlying moisture vapor to escape.
For complete clarity, check the product’s technical data sheet to see how much it can stretch (its elongation percentage) and the recommended dry film thickness. If these align with typical elastomeric benchmarks, you’re likely looking at an elastomeric paint system.
4. Can You Paint Over Elastomeric Paint?
Question: “Can you paint over elastomeric paint?”
Yes, in most cases you can. The main factor is whether the existing elastomeric layer remains in good condition. If it’s peeling, bubbling, or compromised by moisture beneath, that issue needs addressing first. Recoating a flawed or damp surface can lead to new problems, including trapped water or poor bonding.
4.1. Surface Preparation
- Clean Thoroughly
- Use a mild detergent wash or pressure washer (on a gentle setting) to remove dirt, mildew, and loose paint.
- Scrape and Patch
- If any part of the old coating is peeling, carefully remove it. Fill cracks or small holes with a compatible patching compound.
- Check for Dampness
- Let the surface dry thoroughly after cleaning. If moisture lingers behind the paint, the new coat might not adhere properly.
- Consider Primer
- If you plan on switching to a standard acrylic or latex paint, a bonding primer may be necessary to ensure proper adhesion.
4.2. Topcoat Choices
- Another Elastomeric Coat
- Preserves the same flexible protection.
- High-Quality Acrylic
- Often works if the old elastomeric surface is stable. However, you’ll lose some elasticity compared to a full elastomeric system.
- Oil-Based or Alkyd
- Generally avoided because they don’t stretch as the wall moves.
4.3. Watch Your Film Thickness
While it’s tempting to add multiple elastomeric layers, be mindful of the product’s recommended mil thickness. Overly thick coats can struggle to cure evenly or may develop adhesion issues over time.
5. Tips for Applying Elastomeric Paint
5.1. Recommended Tools
- Airless Sprayer: Provides smooth, uniform coverage. Ideal for large walls or entire buildings.
- Long-Nap Roller: Useful for smaller surfaces or more textured areas; just remember elastomeric paint is thicker than standard paints.
- Brush: Best for tight corners, seams, or detail work—but inefficient for large expanses.
5.2. Number of Coats
Elastomeric paint often calls for two coats to achieve the film thickness crucial for bridging cracks. Carefully follow the manufacturer’s instructions on coverage rates (square footage per gallon) to avoid undermining performance.
5.3. Weather Awareness
Aim for moderate temperatures and low humidity when painting. Extreme heat can dry the product too quickly, while cold or damp conditions may slow curing and compromise adhesion.
6. Safety and Preparation
- Protective Gear: Wear goggles, gloves, and a respirator (or dust mask) to guard against particles, fumes, and splash-back.
- Lead Paint Caution: If your home was built before 1978, you might need professional testing or remediation for lead-based paint.
- Local Regulations: Check any rules on disposing paint waste or graywater from cleaning tools.
7. Pros and Cons of Elastomeric Paint
7.1. Pros
- Crack Bridging
- Maintains a uniform finish even when minor fissures appear.
- Moisture Barrier
- Blocks water from penetrating porous materials, reducing mold growth and deeper damage.
- Long-Lasting Finish
- Generally requires fewer repainting cycles, saving time and money.
- Smooth or Textured Finish
- Depending on application technique, you can create a seamless look or a subtle texture.
7.2. Cons
- Higher Cost
- Elastomeric products often have a higher price tag than conventional paints.
- Thicker Application
- Demands careful technique to ensure even coverage and proper drying.
- Potential Moisture Trapping
- If water becomes trapped behind the film, it can lead to peeling or mold pockets.
- Difficult Removal
- Should you wish to strip the surface later, elastomeric paint’s strong bond makes it more labor-intensive to remove.
8. When to Hire a Professional
While many homeowners can handle a modest elastomeric painting project, certain scenarios may call for professional help:
- Large or Multi-Story Exteriors: Balancing on scaffolding or tall ladders while applying thick paint can be daunting.
- Extensive Cracking: Severe or recurring cracks might suggest deeper structural concerns that a contractor should address.
- Testing for Hazards: If you suspect lead paint or other regulated materials, hiring a certified pro is often the safest route.
- Warranty and Expertise: Reputable painters often provide work guarantees and have experience navigating local climate challenges.
9. Final Thoughts
Elastomeric paint stands out as a robust solution for anyone grappling with persistent wall cracks, shifting surfaces, or concerns about water damage. Its stretchy nature allows it to handle minor structural movement without peeling, making it a staple for stucco, concrete, and various forms of masonry.
If you’re curious about Loxon XP, you’ll find it functions similarly to many elastomeric coatings. With notable crack-bridging properties and reliable water resistance, it’s widely seen as a strong contender in the elastomeric lineup.
For those already dealing with an older elastomeric layer, painting over it can be straightforward—as long as you prep properly, repair flaws, and confirm there’s no trapped moisture. Whether you choose to add another elastomeric coat or switch to a high-quality acrylic, it pays to follow product instructions on film thickness, drying times, and any primer requirements.
Above all, prioritize safety and thorough preparation. Wear proper gear, confirm surfaces are dry, and keep an eye on weather conditions before you begin. If your to-do list is long or the situation seems complicated, don’t hesitate to bring in a professional crew. With the right approach, elastomeric paint can protect your home and keep it looking fresh for years to come.