A paste wood filler can be used to fill the grain of the wood, but should be reduced to a satisfactoryīrushing consistency with the recommended thinner. Mahogany patterns or models require special treatment because gypsum cement casts may adhere to undercuts caused by Apply second coat after first coat has thoroughlyĭried.Where a plaster or gypsum cement pattern is used, apply lacquer immediately after set. With lacquer thinner so that the model or pattern readily absorbs the first coat. Two coats of lacquer provide more resistance to moisture than shellac. Patterns of metal, glass, plastic and other impervious materials normally do not require sealing.Ī quick-drying lacquer applied by brush or spray gun is an excellent sealer for wood, plaster and gypsum-cement patternsĪnd master models. Gypsum cement patternsĪlso require sealing to prevent them from absorbing water from the plaster mix and causing the mix to adhere to the gypsumĬement pattern. Wood patterns to prevent dampness from causing the wood to swell, resulting in release difficulty. It “sets up.” Porous model materials require sealing prior to application of the parting compound.Īll porous models, patterns and molds must be sealed before the parting agent is applied. They also permit removal of plaster or gypsum cement from the surface of the pattern or model upon which Parting compounds (also called “separators” or “releasers”) are needed to prevent adhesion of plaster or gypsum cement to Ultimate in a gypsum cement tooling medium. It wasĭesigned to give the patternmaking industry the Ideal for splash-casting molds and modelsįor phenolic, polyester and epoxy resins. Harder andī-11 cements, ULTRACAL 30 cement has the lowestĮxpansion of any rapid-setting gypsum cementĪvailable. Super-strength gypsum cement recommended whereĮxtreme accuracy and greater surface hardness are Has a gradual set and long period of plasticity. It has the lowest expansion of any rapid-setting gypsum cement available. This pottery cement is recommended where extreme accuracy and greater surface hardness are required, as in duplicator models. Specially made for close-tolerance tooling - provides the greatest hardness, accuracy and freedom from efflorescence of any gypsum cement on the market. USG ULTRACAL 30 is a low-absorption gypsum cement for case molds.
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