Product Data Sheet
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BMI Acrylic 400 Medium Finish

Exterior and Interior Acrylic Finish for Building Façades

BMI Acrylic 400 Medium Finish is a ready mixed, flexible textured, decorative and protective wall finish over prepared vertical, above grade concrete, EIFS, masonry and plaster/stucco substrates. BMI Acrylic 400 Medium Finish can be used on either interior or exterior surfaces. BMI Acrylic 400 Medium Finish is available in light or dark tint bases and can be integrally colored with Colorfast pigment system.

  • Excellent adhesion properties*
  • Excellent UV resistance
  • Efflorescence resistance*
  • Resistant to dirt pick up, mildew, algae, and fungal growth
  • Vapor permeable
  • Durable; good surface hardening capabilities
  • Available in light or dark tint bases
  • Meets SCAQMD Rule 1113 when colored with Colorfast pigments
    *When used with BMI Acrylic Primer 100
BMI Acrylic 400 Medium Finish
Product Data Sheet
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Usage

BMI Acrylic 400 Medium Finish may be used over
  • Stucco base coats
  • EIFS
  • Prepared exterior gypsum board lids
  • Prepared concrete masonry in exterior/interior applications
  • Drywall
  • Cement board
  • Sealed gypsum plaster
 

Advantages

  • Excellent adhesion properties*
  • Excellent UV resistance
  • Efflorescence resistance*
  • Resistant to dirt pick up, mildew, algae, and fungal growth
  • Vapor permeable
  • Durable; good surface hardening capabilities
  • Available in light or dark tint bases
  • Meets SCAQMD Rule 1113 when colored with Colorfast pigments
    *When used with BMI Acrylic Primer 100

Packaging

65 lb (29.5 kg) pail

Color

Factory tinted to desired color

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • Exceeds ASTM and ICC Acceptance Criteria
  • SCAQMD Rule 1113 VOC compliant
Product Information

Chemical Base

  • Binder base: 100% acrylic polymer
  • Aggregate: Pure crushed marble, rust-free
  • Water based: VOC compliant
  • Pigment base: Titanium dioxide

Shelf Life

15 months from date of production when stored properly in original, unopened and undamaged sealed packaging

Storage Conditions

Store dry at 50–90 °F (10–32 °C)
Protect from moisture, direct sunlight, and freezing. If frozen, discard material. Do not stack more than 3 pails high.

pH-Value

8.0-10.0
Technical Information

Crack Bridging Ability

ResultICC/ASTM Criteria
1" diameter at -4°F (-20°C)

—

Permeability to Water Vapor

40 perms*

(ASTM E-96 Procedure B)

*Impermeable to water in liquid form, but breathable to water vapor

Resistance to Weathering

ResultICC/ASTM Criteria
Pass @ 5,000 hoursNo deleterious effectsNo deleterious effectsNo deleterious effectsNo deleterious effects at 2,000 hours when viewed under 5X mangification
Pass @ 35 daysNo growth supported during 28 day exposure period

Pass @ 28 days

—

Pass @ 1,000 L

No cracking or loss of film integrity at 500 L of sand

Pass @ 10,000 cycles

¯

Freeze-Thaw Stability

Result

ICC/ASTM Criteria

60 cycles

No deleterious effects at 10 cycles when viewed under 5X magnificationNo deleterious effects at 10 cycles when viewed under 5X magnification

Water Resistance

Result

ICC/ASTM Criteria

Pass @ 28 days

No deleterious effects at 14 day exposure

Salt Spray Resistance

ResultICC/ASTM Criteria

Pass @ 900 hours

No deleterious effects at 300 hours

Reaction to Fire

ResultICC/ASTM Criteria

Flame Spread: 0 to 15

Smoke Developed: 0 to 15

Flame Spread < 25
Smoke Developed < 450

Application

Application Information

Ambient Air Temperature

40–100 °F (4.4–38 °C)

Substrate Temperature

40–100 °F (4.4–38 °C)

Set Time

BMI Acrylic 400 Medium Finish will completely cure in 21 days. During the cure time the finish must be protected from severe weather conditions and from potential abuse from other trades. High humidity and low temperatures will extend set time.

Waiting / Recoat Times

BMI Acrylic 400 Medium Finish is dry to touch within 1–4 hours. Waiting time is dependent on temperature, humidity, and film thickness.
Consumption

Coverage

150–165 ft2( 14-15 m2) per pail. Aggregate size: 1.0 mm.

Normal coating system is one coat. Coverage figures do not include allowance for surface profile and porosity or material waste.
Application steps

MIXING

Mix with a drill mixer and jiffler paddle or similar paddle. Do not exceed 400 rpm when mixing or the product could be air entrained which will increase "pin-holing" and decrease bonding characteristics. If BMI Acrylic 400 Medium Finish is not factory tinted, add liquid color to the pail of finish. Make sure all the color is added by rinsing out the color vial with water into the pail. Up to 16 ounces of clean potable water may be added to BMI Acrylic 400 Medium Finish until desired consistency is achieved.

APPLICATION

BMI Acrylic 400 Medium Finish should be applied with a clean plastic float or a stainless-steel trowel. A plastic float will roll the large aggregates more than a stainless steel trowel and may cause swirling. Continuously dry clean the plastic float or steel trowel while texturing. Use consistent pressure and motion to achieve the desired texture. Enough material should be applied to cover all surfaces. Always apply BMI Acrylic 400 Medium Finish in a continuous application, working to a wet edge to avoid cold joints. Finish material with a plastic float using a "figure 8" pattern. Avoid water drops and runs on uncured material. Variations in color tint should be expected. For spray application, spray with consistent motion, pressure, distance and spray angle to achieve a consistent texture. A job-site mock up for spray application is advised.

CLEANING OF TOOLS

Water soluble prior to drying. Clean tools and equipment with water immediately after use.

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