Description:
Paint Base Exterior Stucco Finish is a factory-prepared portland cement-based exterior texture coat designed to receive exterior paint or elastomeric coatings.

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The product is intended for application over properly cured portland cement plaster basecoats in conventional three-coat stucco systems, Western 1-Kote® systems, Western One-Pass® systems, and Crack Resistant System (CRS) assemblies.

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Paint Base is manufactured as a neutral finish base and is not intended as an integrally colored architectural finish. Final appearance and color are achieved through application of compatible exterior paint systems.

 

Packaging:

• Paint Base is packaged in 90 lb / 40.8 kg bags.

• 35 bags per pallet. 

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Product Uses:
Paint Base Exterior Stucco Finish is intended for use as:

• A cementitious texture coat over cured portland cement plaster basecoats

• A substrate to receive exterior acrylic paint systems

• A substrate to receive elastomeric coatings

• A texture coat for repaint or recoating applications where a neutral cementitious base is required

 

Benefits:

• Factory-controlled cementitious formulation.

• Neutral base designed for paint adhesion.

• Compatible with hand or machine application methods.

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Coverage:
Approximately 72 square feet, 8 square yards, and 6.7 square meters @ 1/8" thickness.

Actual coverage will vary depending on sand blend and texture profile. 

Typical field yield ranges from approximately 72 to 108 square feet per 90 lb bag depending on texture selection and application method, including dash, skip trowel, sand float, and Spanish-style finishes.

 

Mixing:
Dry Bag Base Mixing:

1. Add Paint Base Exterior Stucco Finish to a clean mortar mixer.

2. Add approximately 1.5 to 2.0 gallons of potable water per 90 lb bag.

3. Mix to a uniform consistency suitable for the selected application method. Do not retemper with additional water after initial set has begun. 

4. Minor water adjustment may be made to achieve proper workability. Do not exceed manufacturer’s recommended water addition.

 

Application:
Basecoat plaster shall be fully cured in accordance with ASTM C926 prior to finish application.

Dampen basecoat as necessary to control suction.

Paint Base Exterior Stucco Finish may be applied by:

• Hand trowel application

• Hawk and trowel methods

• Spray application (machine pump)

• Spray-and-float techniques

• Dash or skip trowel methods depending on specified texture

Application thickness shall be consistent with selected texture and aggregate blend.
Application shall comply with ASTM C926 and manufacturer’s written instructions.

 

Curing:
Protect finish from rapid drying, freezing, precipitation, and direct sun exposure during initial cure.

Moist curing may be required under hot, dry, or windy conditions.

Prior to application of exterior paint or elastomeric coatings:

• Allow finish to cure adequately.

• Verify surface pH is within acceptable range for selected coating system.

• Follow paint manufacturer’s recommendations for surface preparation and compatibility.

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Finishing:
Paint Base Exterior Stucco Finish is available in the following aggregate blends:

• Coarse (16/20): Used for heavy skip trowel, sand, or dash finishes. Coarse sands add greater depth and shadowing to stucco textures.

• Medium (20): Used for medium skip troweled textures, lighter sand finishes, and Southwestern-style textures.

• Fine (20/30): Used for less noticeable aggregate finishes.

• Dash: A specialty blend of Fine and Heavy aggregates designed for dash-textured finishes.

• Spanish: Used for a coarser aggregate textured appearance.

Uniform batching, consistent water measurement, and proper curing practices are essential to minimize color variation.

Field sample panels are recommended, particularly for Fine and Smooth finishes.

 

Limitations:

• For exterior use only. 

• Not a waterproofing membrane.

• Does not prevent cracking caused by structural movement, substrate instability, or improper joint placement.

• Control joints shall comply with project drawings and specifications prepared by the design authority, or ASTM C1063.

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Do not apply when surface or ambient temperatures are at or below 40°F / 4.4°C or above 100°F / 38°C. Do not apply to surfaces that are contaminated with bond breakers, oils or other matter that may affect the performance of the product. Do not apply if conditions are expected to be above or below the specified temperature range within 24 hours of application. Do not add additional ingredients without specific written approval from an authorized manufacturer of Western Blended Products.

 

Storage:
Paint Base shall be kept indoors or if stored outdoors, shall be adequately covered to keep dry and be stored off the ground.

 

Applicable Standards, Specifications and Codes:

• ASTM C150 – Portland Cement

• ASTM C926 – Application of Portland Cement-Based Plaster

• 2024 International Building Code (IBC)

• 2024 International Residential Code (IRC)

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Conditions of Use and Limited Warranty:

Specifications for this product are based on optimal environmental conditions (70°F ambient temperature with 50% humidity) for preparation, mixing, application and curing. Specification parameters may vary as environmental conditions change. Consult the product’s Safety Data Sheet or GHS Section located on the product package for hazard identification and first aid measures. KEEP OUT OF REACH OF CHILDREN.

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Western Blended Products (WBP) warrants that its products are of merchantable quality and suitable for the general purpose for which they are intended when applied in accordance with WBP instructions. The manufacturers of WBP products do not warrant the products to be suitable for any purpose or use other than that for which they are intended. Liability under this warranty is limited to supplying new material without charge or, at the option of the manufacturer of the WBP product, refunding the purchase price. In the event of a claim under this warranty, written notice must be provided to the originating plant of the WBP product at the address shown herein. This limited warranty is issued and accepted in lieu of all other express warranties and expressly excludes liability for consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, or limitations on how long an implied warranty lasts; therefore, the above limitations or exclusions may not apply.