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Feature Product – Elasto-flex from Master Wall Inc.

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Master Wall Acrylic Stucco Products from Kodiak Mountain Stone 


Elasto-flex, Elastomeric Acrylic Coating, is a durable elastomeric architectural coating designed to bridge the minor cracking common in stucco applications. When dry it forms a stretchy rubber like film on the surface yet is vapor permeable.

Master Wall Elastoflex acrylic stucco paint


Elasto-flex is available in all Master Wall® colors and custom colors delivered in five-gallon (19L) pails.



375-400 square feet (35-37 square meters) – single coat


*Coverages are estimated and vary


Weight: 53lbs (24 kg)


Working Time: Ready to use right from the pail after pre-mixing.


Drying Time: Varies by air temperature, humidity and surface temperature. Under normal room temperatures Elasto-flex will dry to the touch in 2-4 hours and is ready to recoat after 8 hours. Protect the finish from rain and temperatures less than 40F (5 C) for a minimum of 24 hours.


Application/Storage Temperatures: 40F (5C) to 110F (43C). Store out of direct sunlight.


Shelf Life: 2 years under normal conditions.


Application Procedure

Job Conditions – Air and substrate temperature for application of Elasto-flex must be 50°F (10°C) or higher and must remain 50°F (10°C)or higher for a minimum of 24 hours. Provide temporary protection to protect the wall system from damage until permanent flashings, caps and sealants are installed. Store materials within prescribed temperature limits and out of direct sunlight. Working and drying times are based upon normal room temperature conditions and will vary with temperature and humidity.


Surface Preparation – Surface temperature must be above 50°F (10°C). Surface must be clean, dry, structurally sound and free of efflorescence, oil, grease, form release agents, and curing compounds. On previously painted surfaces, all loose, peeling and chalking paint must be removed. Any glossy areas must be sanded.


Concrete – Must have cured a minimum of 28 days prior to the application of Elasto-flex. If form release agents or curing compounds exist on the surface, they must be removed with an appropriate solution. Remove any residual solution by flushing with water.


Masony – Clean, cured, dry and unpainted.


Stucco – Must be cured, dry and unpainted. If additives were used in the stucco, it is recommended that a test patch be made to evaluate bond strength of the Elasto-flex to the stucco.


Masterwall EIFS – Clean and dry.


Priming – Prime new surfaces such as concrete, masonry and stucco with Master Wall Primecoat to equalize substrate absorption. Priming is not necessary over Master Wall Superior Finishes.


Mixing – Thoroughly stir Elasto-flex into a homogenous consistency. Small amounts of clean, potable water may be added to obtain a workable consistency. Do not over mix. Do not exceed 12 ounces (0.35L) of water per pail. Do not add accelerators or retarders to Elasto-flex.


Application – Elasto-flex can be applied by brush, roller, or airless spray equipment. When using a roller, a maximum ¾ nap is recommended. Apply Elasto-flex in an even, continuous coat, maintaining a wet edge of 20 mils wet for a dry thickness of 10 mils.


Clean Up -Tools and equipment can be cleaned with soapy water when Elasto-flex is wet.


Limitations – Do not use Elasto-flex as a finish directly over any Master Wall base coat.


Information contained in this product data sheet conforms to the standard detail recommendations and specifications for the installation of Master Wall® Inc. products and is presented in good faith. Master Wall Inc. assumes no liability, expressed or implied as to the architecture, engineering, or workmanship of any project. This information may be concurrent with, or superseded by other applicable documents, such as specifications and details. Contact Master Wall® Inc. for the most current product information. 


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