To maintain warranty, subfloor must be properly primed. Use DEPENDABLE PRIMER SL on all surfaces. All supporting surfaces shall be structurally sound, solid, free of movement and well bonded. They shall be free of dust, oil, grease, tar or other contaminants that may act as a bond breaker. Do not apply over single stripwood floors or over wood subfloors prone to excessive swelling (not exterior glue or “underlayment” grade). Porous substrates will require more than one coat. Make sure that the substrate is properly primed/sealed before continuing.

CONCRETE FLOORS
Remove all foreign matter by mechanical means. Floor must be free of efflorescence and excess moisture. To check moisture, test with a calcium chloride test (ASTM F1869), or relative humidity (insitu probe) test (ASTM F2170). To correct moisture problems, see DEPENDABLE’s moisture protection products.

Subsurface must be essentially watertight, as GSL is extremely flowable. Make sure any holes, cracks, etc. that would permit material through to a lower level are patched or filled with DEPENDABLE WHITE SKIMCOAT^TM or POLYSKIM® prior to priming.

Application over textured surfaces generally gives best bond. Extremely smooth, glazed tile may be abraded. Steel troweled concrete can be scarified or bead blasted to give a suitable surface. A test patch for adhesion should be performed if the installer is in doubt. Before starting installation, establish the level around the area to be filled with a transit, level or laser device. Mark a “do not exceed” level around room or area perimeter by snapping a line or marking a minimum level by setting coated nails or screws just below the level to be achieved.

Pump or pour contents onto floor. Because GSL is very flowable, allow it to build in one area until it reaches at least desired depth and maintains that depth even as material flows away. Begin at a corner of room or at a deep part of fill. Plan the pour before starting. Either work back and forth along a line of the room or from the center of the fill outwards in all directions to keep pouring against the freshest material possible. Lightly work the transition points between pours and material over or under desired depth with a D-2 screed or spreader set to the desired depth or lightweight float or straightedge. Material should remain highly flowable and can be walked in for over 45 minutes at normal temperatures. Any imperfection can be smoothed by surface troweling or drawing a straightedge or D-3 smoother over the surface. As material gets stiffer and begins to gel, it may be smoothed or troweled to a fine edge. Once material begins to gel, stay off the area for about 1 hour, after which floor should bear foot traffic. In very hot or windy conditions, protect from wind and mist fog floor. Direct sunlight, heat and wind can cause rapid drying of the product which may reduce working time. To avoid rapid drying, provide protection against these elements. Let material continue to dry before covering until evaporative moisture lessens. Moisture level may be checked by a surface moisture meter, a plastic film taped to the floor, or a plastic bucket left on the floor and the area carefully observed for residual surface moisture upon removal. In thin 1/4" application, may be covered in 4-24 hours depending on drying conditions (temperature, humidity, thickness) and requirements of adhesive and floor covering. For impervious coverings (vinyl, laminate, etc.), be sure GSL is thoroughly dry (at least 16-24 hours). For pours deeper than 3/8", requires longer time or forced drying.

Multiple Lifts: GSL may be placed in multiple lifts or layers. Allow the previous layer to harden and dry until there is no discernible evaporation. Once dry, prime again with Primer SL and apply the next GSL layer. Remember thicker areas of product take longer to dry.

NOTE: Temperature and humidity levels affect the drying characteristics of GSL. However, unlike Portland cement materials, GSL may be force dried with the use of heat or fans once set.

For interior use only. Do not use:

• where hydrostatic pressure (water) is present or moisture emission exceeds level permitted for installed floor covering.
• where surface or ambient temperature falls to or below 45°F 72 hours before or after installation.
• over presswood, particle board, masonite, chipboard, single stripwood floors, luan or similar dimensionally unstable materials susceptible to moving or swelling.
• as a troweled patch or at less than natural minimum flow thickness.
• Exterior, exposed applications or as a wear surface.