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Application Coverage 53 sq. ft./5.0 sq. m 32 sq. ft/3.0 sq. m 13 sq. ft./1.2 sq. m Note: Primer should be applied later in the day as the substrate begins to cool Note WHIP hose contains mixed material requiring that spray be continuous or a purge bucket be available to purge the lines after 15 to 20 seconds of in-activity. Purging can be done with 2 or 3 squeezes on the gun. • Drum heaters are required to heat the material to approxi mately IOO°F/37’C. • The following minimum services shall be provided to run the spray equipment and heaters: - Electric: Single phase, I 10 or 220 volt - Compressed Air: 185 CFM @ 90 psi, treated to assure dry air supply. Moist air is unacceptable and can adversely affect the material. • Once the polyol has been pre-mixed, both components are heated, and the proper pressures are achieved, spray apply the proper millage of Stonchem 441 to the primed substrate. SUBSTRATE Stonchem 441, with the appropriate primer, is suitable for appli cation over concrete, wood, brick, quarry tile, metal or Stonhard mortar systems. For questions regarding other possible sub strates or an appropriate primer, contact your local Stonhard representative or Technical Service. PRIMING Stonchem Epoxy Primer must be applied to the prepared sur face and cured to a tack-free state before applications of the Stonchem 441 begins. For outgassing substrates, a second coat of primer may be applied.The primer can be thickened by adding Stonchem Thixotrope.The use of a primer seals the sub strate and enhances bonding.The primer should be applied using a rubber squeegee. APPLYING STONCHEM 441 Squeegee Application If applying the material by hand the process is as follows: If the components can be heated using heating bands, the mate rial should be heated to approximately 90 to IOO°F. Regardless of the application method, premix the gray polyol prior to portioning the material; it tends to separate in the con tainer. Due to the nature of the materials they must be por tioned in separate containers and then poured into the mixing bucket • Pour the portioned polyol and isocyanate into the mixing bucket If the material has not been heated, the material should be mixed for 90 seconds using a drill and the appropri ately sized mixing blade. Otherwise, mix the material for 60 seconds. • Once the material has been thoroughly mixed, pour it onto the substrate and spread the material to appropriate thickness using a notched squeegee and roller. SUBSTRATE PREPARATION Proper preparation is critical to ensure an adequate bond and system performance.The substrate must be dry and properly prepared utilizing mechanical methods. Questions regarding sub strate preparation should be directed to your local Stonhard representative or Technical Service. CURING The surface of Stonchem 441 will be tack-free in 8 hours at 70°F/21 ’C.The coated area may be put back into service in 24 hours at 7O’F/21 *C, conditions permitting. Thickness 30 mil 50 mil 120 mil Spray Application • As indicated above, the Stonchem 441 can be spray applied. Doing so requires a plural component spray rig with a 2:1 ratio proportion.The preferred spray rig is the following: Spray pump and heating unit - W1WA Duo Mix 230, as manufac tured by WIWA Wilhelm Wagner LP • Spray gun - WIWA 500F Airless Spray gun with one port of entry for the mixed two-component lining material.The spray gun shall be fed by a 1/4 in. swiveling WHIP hose that contains mixed material. APPLICATION GUIDELINES For optimal working conditions, substrate temperature must be between 60 to 80’F/15 to 27°C. Cold areas must be heated until the slab temperature is above 55’F/13’C to ensure the ma terial achieves a proper cure. A cold substrate will make the ma terial stiff and difficult to apply. Warm areas or areas in direct sunlight must be shaded or arrangements made to work during evenings or at night A warm substrate (60 to 80‘F/15 to 27’C) will aid in the material's workability; however, a hot substrate (80 to 9O’F/27 to 32’C) or a substrate directly in the sun will shorten the material's working time and can cause other phe nomenon such as pinholing and bubbling. Substrate temperature should be greater than 5’F/3’C above dew point Exhibit B - Item 22 - Epoxy flooring system Application and curing times are dependent upon ambient and surface conditions. Consult Stonhard’sTechnical Service Depart ment if conditions are not within recommended guidelines. COVERAGE One gallon of Stonchem 441 will cover approximately 1,600 sq. ft./149 sq. m per mil of application thickness. Coverage per gal lon for typical thicknesses are as follows: STORAGE CONDmONS Store all components of Stonchem 441 between 60 to 85 *F/13 to 30*C in a dry area, out of direct sunlight BE SURETO HAN DLE AND STORE PROPERLY.The shelf life is 2 years in the origi nal, unopened container.