Product Overview The Sapphire Goharet Sinai is a white gypsum plaster. The slow-drying nature of the Sapphire Goharet Sinai allows for a well-managed output of elements as the setting time is elongated to accommodate jobs which require a slower pace of drying as to cover more grounds. The Sapphire Goharet Sinai has great workability and ease of application, reduced shrinkage or cracking, and allows for a reduced time of construction with a polished, superior finish.