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Dow SILASTIC™ RTV 4130-J Base for use with XIAMETER™ RTV-4130-J Curing Agent 400 g Bottle. SILASTIC™ J RTV Silicone Rubber is a two component, silicone rubber that has good cut-growth resistance, low shrinkage, easy release, long mold life, highly detailed reproductions and simplified handling. Base only. 4 kg Pail.