Dreaming of plaster signifies maintaining your dignity or holding onto your position and goals. It indicates that you are steadfast in achieving your objectives and are continuously striving to fulfill your dreams. Seeing plaster in your dream can symbolize your self-confidence and stability, which are essential for success in various aspects of your life.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Plaster" (page 332).
Seeing plaster in any form in one's dream means preserving one's dignity, holding to one's status and position, or it could mean persevering in one's goals. Plaster in a dream also could be interpreted as having a good marriage, good children, assiduity, concern for one's religious duties, applying knowledge to one's words, ability to appreciate and to express one's gratitude, recovering from an illness, buying new clothing, or drafting a just agreement. Gypsum in a dream has the same interpretation. Ifa renunciate or a pious person sees plaster or gypsum in his dream, it becomes a proof of an unlawful or sullied substances mixing with their earnings, or it could mean engaging in religious innovations, neglecting to follow the prophetic example, or becoming a hypocrite. (Also see Plasterer)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.