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USG Durock Primer-Sealer - 5 gallon


About

USG Durock Primer-Sealer is a ready to use, fast drying acrylic primer. It is a single-coat application product, suitable for applications over well bonded, sound, stable, and clean existing floor coverings that are on concrete subfloors.

Specs

  • Coverage: 300-350 square feet per gallon
  • Dilution Rate: 1:2
  • Substrate Type: Wood

    Instructions

    Use USG Durock Primer-Sealer for priming the concrete or wood subfloor prior to application of any USG Durock Self-Leveling Underlayment. For applications over compromised gypsum underlayments, see USG Rehabilitation Guidelines for Damaged Gypsum Underlayments (CB822) prior to installation. Proper use of USG Durock Primer-Sealer effectively seals the subfloor, enhances bond and prevents formation of pinholes, domes, and craters in USG Durock Self-Leveling Underlayments due to the upward migration of air bubbles from the subfloor.

    Floors to be primed must be dry, structurally sound, and clean. Remove any dirt, tar, wax, oil, grease, latex compounds, sealers, curing compounds, release agents, asphalt, water-soluble adhesives, paint, chemicals, loose topping, joint compounds from drywall installation or any other contaminant that might interfere with development of good bond.

    For primer application, the temperature of USG Durock Primer-Sealer, the subfloor and the room must be maintained between 50°F and 95°F (10°C and 35°C) for a period of 48 hours before, during and after application. Shake well and pour the contents into a clean bucket. If dilution is required, add the appropriate amount of water based on the information provided in the Application sections on pgs. 2 and 3. Mix the diluted solution with a paddle mixer at slow speed for approximately one minute. Next, apply primer to the subfloor at the coverage rate specified for the corresponding type of substrate surface. Work primer into the surface using a push broom. Apply evenly and do not puddle. The actual coverage of the primer will depend upon the nature and porosity of the subfloor.

    For applications over concrete and nonporous subfloors, diluting the USG Durock Primer-Sealer is not required. Dry time is estimated to be three hours at 70°F and 65% relative humidity. Allow primer to dry at least three hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

    When applying USG Durock Primer-Sealer over porous concrete, shot-blasted subfloors and wood subfloors, allow the diluted primer to dry for a minimum of two hours, but not more than 18 hours, prior to the application of the USG Durock Self-Leveling Underlayment. High absorption concrete may require additional coats of primer. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

    When using the diluted primer as a surface sealer over USG Durock Multi-Use Self-Leveling Underlayments, allow a minimum of three hours for drying prior to the application of floor converings adhesives. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

    Contact USG when considering USG Durock Primer-Sealer for multiple-lift applications of USG Durock Self-Leveling Underlayments and prior to using the product as a surface sealer over any USG Durock or USG Levelrock underlayments not mentioned in this document.


    Application

    As primer over nonporous subfloors or USG Durock Brand RH-100 Moisture Vapor Reducer

    1. Allow USG Durock Brand RH-100 Moisture Vapor Reducer to cure at least four hours before applying USG Durock Primer-Sealer.
    2. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50°F (10°C) for 48 hours before, during and after job completion.
    3. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust, or any other contaminant before application of primer. the use of oil-based sweeping compounds is not recommended.
    4. Apply a single coat of USG Durock Primer-Sealer (no dilution) with a paint roller or push broom at an application rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) prior to installation of USG Durock Self-Leveling Underlayments.
    5. Allow primer to dry at least three hours, but not more than 18 hours, before installation of USG Durock Self-LEveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part of potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) with roller or push broom and allow three hours for drying prior to underlayment application.

    As primer for highly porous/shot-blasted concrete subfloors

    1. New concrete must be cured a minimum of 28 days.
    2. When the Moisture Vapor Emission Rate (MVER) exceeds 5 lbs. (2.3 kg)/1000 sq. ft. (92.9 m2)/24 hours per ASTM F1869 or a relative humidity (RH) greater than 80% per ASTM F2170, then the concrete subfloor must be treated with USG Durock RH-100 Moisture Vapor Reducer.
    3. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50°F (10°C) for 48 hours before, during and after job completion.
    4. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust or any other contaminant before application of primer. The use of oil-based sweeping compounds is not recommended.
    5. Apply using  a partially diluted mixture (1:2) of one part USG Durock Primer-Sealer to two parts potable water with a paint roller or push broom at a rate of 200-250 square feet per gallon (4.9-6.1 square meters per liter).
    6. Allow primer to dry at least two hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) and allow three hours for dryign prio to underlayment application.

    As primer for wood subfloors and USG structural panels

    1. Plywood or OSB; must meet APA Type 1 or 2 standards.
    2. Plywood or OSB should not contain more than 12% moisture.
    3. Weak, rotted, or damaged wood should be replaced prior to priming.
    4. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50F (10C) for 48 hours before, during and after the job.
    5. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust, or any other contaminant before application of primer. The use of oil-based sweeping compounds is not recommended.
    6. Apply using a partially diluted mixture (1:2) of one part USG Durock Primer-Sealer to two parts potable water with a paint roller or push broom at a rate of 300-350 square feet per gallon (7.4-8.6 square meters per liter).
    7. Allow primer to dry at least two hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) and allow three hours for drying prior to underlayment application.

    As sealer for USG Durock brand Multi-Use Self-Leveling Underlayments

    1. Seal USG Durock Multi-Use Self-Leveling Underlayments prior to application of water-based adhesives, floor patches or mortars.
    2. At the job site, USG Durock Primer-Sealer and underlayment must be maintained at a minimum at 50°F (10°C) for 48 hours before, during and after job completion. Radiant heat systems should be shut down during application and drying of primer.
    3. Underlayment must be free of dirt, wax , polish, paint, excess dust, or other contaminants before application of USG Durock Primer-Sealer. The use of oil-based sweeping compounds is not recommended.
    4. Underlayment must be dry prior to application of USG Durock Primer-Sealer. Good air movement is critical to drying of underlayment. Check for dryness by taping down a sheet of plastic approximately 18 in. x 18 in. (457 mm x 457 mm). Tape must seal all sides of plastic. After 16 hours, a lack of condensation or no noticeable darkening of USG Durock underlayment indicates that the floor is dry. Be sure to check for dryness in corners where airflow may be restricted. See ASTM D4263 for complete instructions.
    5. Apply fully diluted primer (1:4) of one part USG Durock Primer-sealer to foru parts potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter). The USG Durock Primer-Sealer dilution can be sprayed or applied with a paint roller to the underlayment surface. Do not allow USG Durock Primer-Sealer to puddle. Do not overseal USG Durock Multi-Use Self-Leveling Underlayments.
    6. Allow USG Durock Primer-Sealer to dry for three hours before installation of floor-covering products. Dry time will vary with drying conditions.
    7. Consult your USG representative when applying uniform materials.
    8. Priming the underlayment may not be required when using high-solids urethane adhesives for wood floor attachment. However, insuring that the underlayment is completely dry prior to wood floor attachment is especially critical.
    9. Recommendations of the floor-covering and floor-covering adhesive manufacturers supercede these instructions.


    Limitations

    • Do not use in exterior applications.
    • Do not use as a wear surface.
    • Do not install where continuous exposure to moisture is a possibility.
    • Do not install on excessively dusty floors.
    • Do not use on water-soluble adhesive residues.
    • Do not use as a primer under dispersion wood floor adhesives.
    • If high-solids adhesives are used, do not seal USG Durock Multi-Use Self-Leveling Underlayments with USG Durock Primer-Sealer. Follow floor-covering manufacturers' recommendations for surface-sealing requirements.


    Cleanup

    Clean tools with water before USG Durock Primer-Sealer dries. Use mineral spirits to clean dried sealer. Carefully read manufacturer's warnings and instructions before using mineral spirits.

    See More

    USG Durock Primer-Sealer - 5 gallon

    Prime wood, concrete, and gypsum subfloors in one coat using this fast-drying, high-solids, floor primer from USG Durock. Instantly prepares most subfloors to receive a USG Self-Leveling Underlayment.
    • Ready to use
    • Enhances the bond between substrate and underlayment
    • Mildew-resistant; does not stain finished floor coverings
    • Has no adverse effect on floor-covering adhesives
    Quantity must be 1 or more

    Regular price
    $155.95
    Sale price
    $155.95
    Prime wood, concrete, and gypsum subfloors in one coat using this fast-drying, high-solids, floor primer from USG Durock. Instantly prepares most subfloors to receive a USG Self-Leveling Underlayment.
    • Ready to use
    • Enhances the bond between substrate and underlayment
    • Mildew-resistant; does not stain finished floor coverings
    • Has no adverse effect on floor-covering adhesives

    About

    USG Durock Primer-Sealer is a ready to use, fast drying acrylic primer. It is a single-coat application product, suitable for applications over well bonded, sound, stable, and clean existing floor coverings that are on concrete subfloors.

    Specs

    • Coverage: 300-350 square feet per gallon
    • Dilution Rate: 1:2
    • Substrate Type: Wood

      Instructions

      Use USG Durock Primer-Sealer for priming the concrete or wood subfloor prior to application of any USG Durock Self-Leveling Underlayment. For applications over compromised gypsum underlayments, see USG Rehabilitation Guidelines for Damaged Gypsum Underlayments (CB822) prior to installation. Proper use of USG Durock Primer-Sealer effectively seals the subfloor, enhances bond and prevents formation of pinholes, domes, and craters in USG Durock Self-Leveling Underlayments due to the upward migration of air bubbles from the subfloor.

      Floors to be primed must be dry, structurally sound, and clean. Remove any dirt, tar, wax, oil, grease, latex compounds, sealers, curing compounds, release agents, asphalt, water-soluble adhesives, paint, chemicals, loose topping, joint compounds from drywall installation or any other contaminant that might interfere with development of good bond.

      For primer application, the temperature of USG Durock Primer-Sealer, the subfloor and the room must be maintained between 50°F and 95°F (10°C and 35°C) for a period of 48 hours before, during and after application. Shake well and pour the contents into a clean bucket. If dilution is required, add the appropriate amount of water based on the information provided in the Application sections on pgs. 2 and 3. Mix the diluted solution with a paddle mixer at slow speed for approximately one minute. Next, apply primer to the subfloor at the coverage rate specified for the corresponding type of substrate surface. Work primer into the surface using a push broom. Apply evenly and do not puddle. The actual coverage of the primer will depend upon the nature and porosity of the subfloor.

      For applications over concrete and nonporous subfloors, diluting the USG Durock Primer-Sealer is not required. Dry time is estimated to be three hours at 70°F and 65% relative humidity. Allow primer to dry at least three hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

      When applying USG Durock Primer-Sealer over porous concrete, shot-blasted subfloors and wood subfloors, allow the diluted primer to dry for a minimum of two hours, but not more than 18 hours, prior to the application of the USG Durock Self-Leveling Underlayment. High absorption concrete may require additional coats of primer. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

      When using the diluted primer as a surface sealer over USG Durock Multi-Use Self-Leveling Underlayments, allow a minimum of three hours for drying prior to the application of floor converings adhesives. High air relative humidity and/or low subfloor temperature may necessitate a longer drying time.

      Contact USG when considering USG Durock Primer-Sealer for multiple-lift applications of USG Durock Self-Leveling Underlayments and prior to using the product as a surface sealer over any USG Durock or USG Levelrock underlayments not mentioned in this document.


      Application

      As primer over nonporous subfloors or USG Durock Brand RH-100 Moisture Vapor Reducer

      1. Allow USG Durock Brand RH-100 Moisture Vapor Reducer to cure at least four hours before applying USG Durock Primer-Sealer.
      2. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50°F (10°C) for 48 hours before, during and after job completion.
      3. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust, or any other contaminant before application of primer. the use of oil-based sweeping compounds is not recommended.
      4. Apply a single coat of USG Durock Primer-Sealer (no dilution) with a paint roller or push broom at an application rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) prior to installation of USG Durock Self-Leveling Underlayments.
      5. Allow primer to dry at least three hours, but not more than 18 hours, before installation of USG Durock Self-LEveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part of potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) with roller or push broom and allow three hours for drying prior to underlayment application.

      As primer for highly porous/shot-blasted concrete subfloors

      1. New concrete must be cured a minimum of 28 days.
      2. When the Moisture Vapor Emission Rate (MVER) exceeds 5 lbs. (2.3 kg)/1000 sq. ft. (92.9 m2)/24 hours per ASTM F1869 or a relative humidity (RH) greater than 80% per ASTM F2170, then the concrete subfloor must be treated with USG Durock RH-100 Moisture Vapor Reducer.
      3. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50°F (10°C) for 48 hours before, during and after job completion.
      4. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust or any other contaminant before application of primer. The use of oil-based sweeping compounds is not recommended.
      5. Apply using  a partially diluted mixture (1:2) of one part USG Durock Primer-Sealer to two parts potable water with a paint roller or push broom at a rate of 200-250 square feet per gallon (4.9-6.1 square meters per liter).
      6. Allow primer to dry at least two hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) and allow three hours for dryign prio to underlayment application.

      As primer for wood subfloors and USG structural panels

      1. Plywood or OSB; must meet APA Type 1 or 2 standards.
      2. Plywood or OSB should not contain more than 12% moisture.
      3. Weak, rotted, or damaged wood should be replaced prior to priming.
      4. Job site and USG Durock Primer-Sealer must be maintained at a minimum of 50F (10C) for 48 hours before, during and after the job.
      5. Subfloor must be free of dirt, wax, polish, joint compound, paint, excess dust, or any other contaminant before application of primer. The use of oil-based sweeping compounds is not recommended.
      6. Apply using a partially diluted mixture (1:2) of one part USG Durock Primer-Sealer to two parts potable water with a paint roller or push broom at a rate of 300-350 square feet per gallon (7.4-8.6 square meters per liter).
      7. Allow primer to dry at least two hours, but not more than 18 hours, before pouring USG Durock Self-Leveling Underlayment. If 18 hours has passed and the underlayment has not been poured, recoat the subfloor with a partially diluted mixture (1:1) of one part USG Durock Primer-Sealer to one part potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter) and allow three hours for drying prior to underlayment application.

      As sealer for USG Durock brand Multi-Use Self-Leveling Underlayments

      1. Seal USG Durock Multi-Use Self-Leveling Underlayments prior to application of water-based adhesives, floor patches or mortars.
      2. At the job site, USG Durock Primer-Sealer and underlayment must be maintained at a minimum at 50°F (10°C) for 48 hours before, during and after job completion. Radiant heat systems should be shut down during application and drying of primer.
      3. Underlayment must be free of dirt, wax , polish, paint, excess dust, or other contaminants before application of USG Durock Primer-Sealer. The use of oil-based sweeping compounds is not recommended.
      4. Underlayment must be dry prior to application of USG Durock Primer-Sealer. Good air movement is critical to drying of underlayment. Check for dryness by taping down a sheet of plastic approximately 18 in. x 18 in. (457 mm x 457 mm). Tape must seal all sides of plastic. After 16 hours, a lack of condensation or no noticeable darkening of USG Durock underlayment indicates that the floor is dry. Be sure to check for dryness in corners where airflow may be restricted. See ASTM D4263 for complete instructions.
      5. Apply fully diluted primer (1:4) of one part USG Durock Primer-sealer to foru parts potable water at a rate of 400-450 square feet per gallon (9.8-11.0 square meters per liter). The USG Durock Primer-Sealer dilution can be sprayed or applied with a paint roller to the underlayment surface. Do not allow USG Durock Primer-Sealer to puddle. Do not overseal USG Durock Multi-Use Self-Leveling Underlayments.
      6. Allow USG Durock Primer-Sealer to dry for three hours before installation of floor-covering products. Dry time will vary with drying conditions.
      7. Consult your USG representative when applying uniform materials.
      8. Priming the underlayment may not be required when using high-solids urethane adhesives for wood floor attachment. However, insuring that the underlayment is completely dry prior to wood floor attachment is especially critical.
      9. Recommendations of the floor-covering and floor-covering adhesive manufacturers supercede these instructions.


      Limitations

      • Do not use in exterior applications.
      • Do not use as a wear surface.
      • Do not install where continuous exposure to moisture is a possibility.
      • Do not install on excessively dusty floors.
      • Do not use on water-soluble adhesive residues.
      • Do not use as a primer under dispersion wood floor adhesives.
      • If high-solids adhesives are used, do not seal USG Durock Multi-Use Self-Leveling Underlayments with USG Durock Primer-Sealer. Follow floor-covering manufacturers' recommendations for surface-sealing requirements.


      Cleanup

      Clean tools with water before USG Durock Primer-Sealer dries. Use mineral spirits to clean dried sealer. Carefully read manufacturer's warnings and instructions before using mineral spirits.