Application Procedure
General-Air and substrate temperature for application of Superior Stone must be 40°F (5°C) or higher and must remain 40°F (5°C) or higher for a minimum of 24 hours. Working and drying times are based upon normal room temperature conditions and will vary with temperature and humidity.
Preparation - The substrate must be approved by Master Wall Inc., clean, dry, structurally sound and free of efflorescence, oil, grease, form release agents and curing compounds or anything that would affect bond. Painted surfaces are not acceptable and must be removed. Concrete and surfaces should cure for a minimum of 28 days. Stucco should be cured until clean, dry and hard-typically 14 days.
Interior drywall should be finished and made ready for paint. Prime surfaces with Primecoat primer prior to finishing with Superior Stone.
Base Coats - must be flat, dry hard, and free of efflorescence. Master Wall base coats must cure a minimum of 12 hours before application of Superior Finish. Substrates of brick, masonry or concrete should be leveled smooth using either Master Wall base coats or stucco.
Mixing-Thoroughly stir the Superior Stone Finish using a heavy duty 1/2 (12.7 mm) drill at 400-500 rpm and a paddle similar to a Wind-lock B-MTW mixer. Small amounts of clean, potable water may be added to obtain a workable consistency. To avoid texture or coverage variations, add the same amount of water to each pail. Don’t exceed 24 ounces (0.7L) of water per pail.
Application-Prime the surface with Master Wall Primecoat tinted to match the predominate color of stone in the selected Superior Stone color. Allow Primecoat to dry a minimum of 12 hours prior to finish coat application.
Superior Stone Finish should be applied in two coats. The first coat can be trowel or spray applied.
Trowel Application-Apply the Superior Stone Finish to the clean, dry and cured base coat with a stainless steel trowel. Trowel finish uniformly then scrape down to a thickness equal to the size of the aggregate. Trowel to eliminate trowel marks and irregularities.
Spray Application-Using a conventional plaster hopper gun or a proven pump, spray two coats of the finish over the primed base coat to achieve the desired texture. If the first coat was trowel applied, a minimum of one spray coat is required as the finish coat. Use a circular overlapping pattern keeping the spray gun at a 90º angle to the surface maintaining the same distance to the wall at all times. The first coat should dry a minimum of one hour prior to the application of the second coat. Be cautious of flooding an area with too much finish as it may appear shinier when it dries.
Clean Up-Tools and equipment can be cleaned with soapy water while the finish coat is still wet.
For Professional Results
Apply finish coats away from direct sunlight. Cold joints or color variations can occur if the finish dries too quickly.
Surfaces exposed to the weather must be sloped (6:12 minimum).
Finishes are intended for the approved substrates listed above and should not be applied directly to gypsum board or insulation board products except as noted above.
