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Durock Alfacing International PREP COAT Q

PREP COAT Q is a fast drying, dry polymer based dry-mix material that is field-mixed with water. It is ideal for use in cold temperature, high humidity conditions. It is a trowel-applied high performance coating for use on DuROCK PUCCS and InsulROCK Systems as a non-combustible base coat and adhesive. Prep Coat Q is a flexible and durable base coat that can also be used as a leveling coat for stucco, concrete and masonry substrates. It has excellent freeze-thaw stability, low water absorption, breathable to water vapor and non-combustible. It is a convenient product since it requires only water to be added on site.

Product Type: Base Coat

Compatible Substrates & Surfaces: Concrete, Masonry

Features: Breathable, Combustion Resistant, Fast Drying, Freeze/Thaw Stability, High Performance, Low Water Absorption

Application Method: Trowel

Technical Data SheetSafety Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Product Type

Base Coat

Technologies

Ready-to-Use Products

Product Families

Ready-to-Use Products — Paints & Coatings

Base Coats & Undercoats

Features & Benefits

Ready-to-Use Product Features

Breathable,

Combustion Resistant,

Fast Drying,

Freeze/Thaw Stability,

High Performance,

Low Water Absorption

Applications & Uses

Markets

Building & Construction,

Paints & Coatings

Applications

Paints & Coatings — Building & Construction

Concrete Coatings & Stains

Building & Construction — Decorative Materials & Finishes

Decorative Paints, Coatings & Stains

Application Method

Trowel

Compatible Substrates & Surfaces

Concrete,

Masonry

Applications & Coverage
  • Substrate must be clean, dry, and free of cracks or loose material. Surface and ambient temperatures must be at least 4°C (40°F) a minimum of 24 hours, and must remain so until Prep Coat Q has dried. Do not apply Prep Coat Q in direct sunlight at temperatures exceeding 30°C (86°F) and protect from winds exceeding 25 km/hr (15 mph) as well as precipitation for at least 24 hours.
  • Apply Prep Coat Q with a stainless steel trowel to achieve a minimum dry thickness of at least 2.0 mm ( 1 /12 inch) and embed DuROCK Fiber Mesh as per system specifications. This may require two passes, allowing the first coat to cure sufficiently to be dry and firm to the touch before application of the second coat. Applied as an adhesive, Prep Coat Q shall be rendered with a notched trowel, conforming to the adhesive pattern delineated in the system specifications.

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Compressive Strength (1378 PSI at 1day)9.5MPa-
Compressive Strength (2016 PSI at 7day)13.9MPa-
Compressive Strength (3756 PSIat 28day)25.9MPa-

Packaging & Availability

Packaging & Availability

Prep Coat Q is available in 22.7 kg (50 lbs) bags, yielding approximately 7.5 m 2 (80 ft 2 ) at a nominal dry film thickness of 2.0 mm ( 1 /12 inch).

Storage & Handling

Storage & Mixing
  • Store Prep Coat Q in a dry place away from direct sunlight. Employ temporary protection measures as needed. Prep Coat Q cannot be permitted to freeze once it has been mixed with water.
  • Using a stainless steel or corrosion resistant mixing blade and power drill, start with 4.5 L (1.2 gallons) water, gradually add one bag of Prep Coat Q and mix at 400 – 500 rpm, ensuring not to induce air into the product, until a uniform paste consistency is attained. Let the mixture stand for 5 minutes, then re-mix before use.
  • Up to 250 mL (8 oz) of potable water can be added to a full mix of Prep Coat Q to adjust workability. Accelerators and other additives are prohibited and will void warranty. Discard any material that has begun to stiffen.