WGL203 Wood Gypsum Leveling

DESCRIPTION 

PrepWorx WGL203 is a quick-dry gypsum self-leveling compound for use over wood / gypsum for depths up to 2 inches. 

APPROVED SUBSTRATES

  • Interior use only for residential and commercial applications 

  • Produces flat, smooth surfaces for installing textile, resilient, ceramic, and engineered wood floor coverings 

  • Suitable over:

  • Structurally sound concrete 

  • APA Exposure Type 1 plywood, OSB, or equivalent subfloors 

  • Well-bonded hard surface flooring (e.g., terrazzo, ceramic tile, stone, epoxy coatings) 

  • Well-bonded, non-water-soluble adhesive residues (including cutback adhesive) 

  • Existing gypsum and Portland-based leveling compounds 

  • For use over radiant heat systems. 

  • Do not use over chemically abated substrates.

                            

                 

SUBSTRATE TESTING 

  • Refer to substrate moisture limits per flooring installation requirements. 

  • Moisture testing per ASTM F-2170 In-situ Relative Humidity: Testing must be performed per latest revision. Three tests must be conducted for the first 1000 SF and one additional test per 1000 SF. 

  • Moisture Testing per ASTM F-2170 In-situ Relative Humidity: 75%RH 

  • Vapor retarder compliant with ASTM E1745 is in place and absent of hydrostatic pressure.  

  • If RH exceeds acceptable levels, apply a moisture control system like PrepWorx MCS310 or PrepWorx VBS311.  

SUBSTRATE PREPARATION 

  • Substrates must be structurally sound, clean, and surface dry. 

  • Substrate must be free of dust, dirt, oil, grease, paint, curing agents, concrete sealers, loosely bonded toppings, loose particles and any other substance or condition that may prevent or reduce adhesion. 

  • Any weakly bonded or soft surface material, such as loose patching compounds, leveling compounds, floor coverings, or coatings, must be removed. 

  • Do not use sweeping compounds. 

Concrete Substrate: 

  • Concrete and cementitious substrates must be fully cured and free of hydrostatic pressure and topical moisture.  

  • Clean surfaces using mechanical methods and avoid using acid etching or sanding, which will not provide adequate bonding preparation.   

  • For dormant cracks wider than 1/32” (0.8 mm), PrepWorx CJR400 may be used to repair. 

  • It is recommended to fill dormant cracks and saw cuts deeper that 1”, using PrepWorx MRR111. 

  • Ensure all moving joints, including expansion and isolation joints, as well as moving cracks, are properly addressed and accounted for throughout the entire flooring system, including the finish layer. No flooring material should be installed over these areas. 

  • If no moisture control system is needed, prime the clean surface with PrepWorx VBC301. 

Wood Substrate: 

  • Wood substrates must provide a rigid base and be securely fastened without excessive vertical movement. The surface of the wood must be clean and free of oils, grease, wax, dirt, varnish, shellac, and any contaminates that would impair adhesion. If necessary, sand down to bare wood. Do not apply totalworx products directly to fire-retardant or pressure-treated wood surfaces. 

WARNING:  DO NOT SAND, DRY SWEEP, DRY SCRAPE, DRILL, SAW, BEAD BLAST OR MECHANICALLY CHIP OR PULVERISE EXISTING RESILIENT FLOORING, BACKING, LINING FELT, ASPHALTIC “CUTBACK” ADHESIVES OR OTHER ADHESIVES.  

These products may contain either asbestos fibers and/or crystalline silica.  Avoid creating dust. Inhalation of such dust is a cancer and respiratory tract hazard. Smoking by individuals exposed to asbestos fibers greatly increases the risk of serious bodily harm. Unless positively certain that the product is a non‐ asbestos‐containing material, you must presume it contains asbestos. Regulations may require that the material be tested to determine asbestos content and may govern the removal and disposal of material.  See current edition of the Resilient Floor Covering Institute (RFCI) publication Recommended Work Practices for Removal of Resilient Floor Coverings for detailed information and instructions on removing all resilient covering structures.  For current information go to www.rfci.com. 

APPLICATION INSTRUCTIONS AND COVERAGE RATES 

Read and follow the product specific installation guidelines for layout, design and any special instructions for installation. 

  • Installation site must be acclimated with HVAC in operation, or the temperature must be controlled between 60-77 °F (16-25 °C) and the ambient relative humidity controlled below 65% before, during and for 72 hours after the installation. 

  • Do not apply when the temperature is below 50ºF (10ºC).  

  • Do not use over water-soluble adhesive residues or substrates containing asbestos. 

  • Do not use over existing building expansion or control joints 

Mixing 

  • Pour 5-5.5 quarts (4.75- 5.25 liters) of cold, clean water per 50 lb. bag into a clean container. 

  • Slowly pour in the powder and mix vigorously for 1 minute per bag until blended to a viscous, lump-free consistency. Use a heavy-duty drill with an Oval mixing paddle (minimum 650 rpm). 

  • Do not over water the mixture, as additional water weakens the material. 

Application 

  • Pour the mix onto the primed substrate. Flow time is approx. 20-30 minutes. 

  • Flow Ring Spread 6.5-inch (166mm) ASTM C1708 ​

  • Distribute product evenly with a suitable gauging tool and smooth or spike roll the wet finish promptly. 

  • Product is dry to accept foot traffic after 2 hours. 

  • Ready for the installation of floor coverings after approximately 16 hours for depths < 1/8" (3 mm) *. Depth of application, ambient conditions, and surface porosity will affect dry time. 

Curing 

  • Drying times may vary based on environmental conditions and the thickness of the application. 

  • Foot traffic can begin 2-3 hours after installation. 

  • For ceramic, porcelain, or quarry tiles, allow up to 6 hours for curing. 

  • Most floor coverings can be installed after 24 hours, depending on thickness and substrate. For applications greater than 3/8” (9 mm), conduct a mat test (ASTM D4263) before installing floor coverings. 

  • Always refer to floor covering guidelines for installation over cement-based patch products. 

  • Ensure proper ventilation for sufficient curing. Do not apply fans or other forced air to surface.

Coverage Rates 

  • Coverage rates are approximate values. Actual coverages may vary according to substrate conditions and thickness of the application. 

  • Coverage rate at 1/8" (6 mm) depth approx. 60sq. ft. (5.57 m² at 3 mm per 22.7 kg bag) per 50 lb. bag 

PRODUCT CHARACTERISTICS 

Weight 

50 lbs. / bag 
Pallet Quantity  42 bags / pallet
Pallet Weight 2165 lbs.
Physical State Dry Powder 
Color  White

Shelf Life 

Up to 12months in original unopened packaging
Storage Store away from direct sunlight in a well-ventilated, cool, dry area. If storing after opening, remove all air from packaging and seal tightly.
Freeze/Thaw Freeze thaw stable

Compressive Strength 

Compressive: 5,200 psi at 28 days flexural: 1,000 psi @ 28 days ASTM C1708 | air cure  

Cleaning Instructions 

While still fresh, wash hands, tools and equipment with warm soapy water. 

Traffic / Installation

  • Foot Traffic: 2 hr* 

  • Installation: Carpet, LVP/LVT/Sheet Goods, Ceramic:  1/8”(3mm) 16 hours*, ¼"(6mm) 2-3 Days*, 3/8” (9mm) 7 days*, ¾" (18mm) 10-14 days* 

  • Installation: Engineered Wood 1/8” (3mm) 2-3 days*, Each Additional 1/8” (3mm) 1 day* 

*Over porous surface at 70 degrees F (21 degrees C) and 65% ambient RH.

environmental

  • California South Coast Air Quality Management District Rule 1168
  • California Department of Public Health Section 01350
  • SCS Global Advantage Gold - SCS-IAQ-11081
LEED IEQ Credit Information (2009 and V4)
Credit Requirement Status Comment
Meets General Emissions Evaluation Criteria Complies SCS-IAQ-11081
VOC’s (Rule #1168 of California SCAQMD amended October 6, 2017) Complies VOC Content Between 0.5 mg.m3 and 5.0 mg/m3 

WARRANTY 

Standard product warranty is 1 year.  When combined with certain PrepWorx moisture management and flooring adhesive products the term of warranty is extended ranging from 10 to 20 years.  See Shaw System Warranty (Warranties) for complete details. PrepWorx Floor Preparation 1 Year Limited Warranty

PRECAUTIONS 

Carefully read and follow all precautions and warnings on the product label. For complete safety information, please refer to the Safety Data Sheet.

Revision: 02112026
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