USG Ultimate Drystone™ Casting Media is a unique product that requires no oven drying – you cancast, paint, package and ship in one day. USG Ultimate Drystone Casting Media offers excellentduplication of fine detail, high compressive strength and a high density that provides a quality feel.Ideal for solid cast pieces, USG Ultimate Drystone Casting Media is formulated to increase chipresistance and is an excellent alternative to polyester resin. MIXING INSTRUCTIONS Use potable water at temperatures between 70 °F (21 °C) and 100 °F (38 °C). Because variations inslurry (USG Ultimate Drystone Casting Media and water mixture) temperature produce variationsin set time, it is important to keep both the USG Ultimate Drystone Casting Media and water in astable temperature environment prior to use. The higher the temperature of the slurry, the shorterthe set time. Conversely, the lower the temperature of the slurry, the longer the set time. Weigh both the USG Ultimate Drystone Casting Media and the water prior to use for each mix. Thewater-to-USG Ultimate Drystone Casting Media ratio is critical because it governs the strength andthe density of the final cast. Sift or strew USG Ultimate Drystone Casting Media into the water slowly and evenly; start mixingimmediately. Mixing the plaster slurry is one of the most important steps in producing plaster molds withmaximum strength, absorption, hardness and other important properties. IMPORTANT – USG Ultimate Drystone Casting Media must be mechanically mixed with a batchprocess. Proper blade and bucket dimensions are important for obtaining the best batch mix (SeeUSG IG503 Plaster Mixing Procedures for details). Longer mixing times result in higher mold strength and shorter set times. POURING To prevent air entrainment and provide a uniform, smooth surface, careful pouring of USG UltimateDrystone Casting Media slurry is necessary. Agitation of the filled mold is a further step used toprevent air at or near the mold surface. Whenever possible, USG Ultimate Drystone Casting Mediaslurry should be poured carefully in the deepest area so that the slurry flows evenly across thesurface of the case mold.Pouring a large amount of slurry directly on the face of the case mold may result in slightdensification of the USG Ultimate Drystone Casting Media mold at the point where it strikes thesurface of the case. This produces a hard spot, giving uneven absorption.USG Ultimate Drystone Casting Media can be used with most mold materials such as silicone, latexor urethane-type molds.To prepare the mold, make sure it is clean, then dip the mold or spray it with a suitable mold rinse.Using a steady rate, pour the USG Ultimate Drystone Casting Media slurry into one corner of themold or into the lowest point and allow the slurry to rise and seek its own level. Continue pouringuntil the mold is full. To minimize air entrainment, mechanically vibrate or shake the mold or thesurface onto which the mold is placed. Do not vibrate for more than 30 seconds.Demold USG Ultimate Drystone Casting Media after it reaches peak heat (approximately 30 minutesafter set). DRYING All casts should be air dried as quickly as is safely possible after manufacture so that maximumphysical properties can develop. Dry to a constant weight. To aid in the drying and cooling downprocess, remove the hardened USG Ultimate Drystone Casting Media cast from the mold, or loosenthe mold walls and allow air to circulate the cast. FINISHING If trimming is required, do so immediately after demolding. USG Ultimate Drystone Casting Mediaproducts can be decorated approximately 2-4 hours after set time. STORAGE AND USE When properly used, USG Ultimate Drystone Casting Media is easy to work with and complieswith the federal Labeling of Hazardous Art Materials Act, 12 U.S.C. Section 1277. Keep indoors attemperatures between 65 °F – 75 °F (18 °C – 24 °C) and 45% – 55% RH. Do not stack more thantwo pallets high. Keep from drafts. Rotate stock. USG Ultimate Drystone Casting Media should beused within six months of the manufacturing date located on the package. Always follow handlingand use directions and safety warnings on the package. SDS
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