ขอมูลทั้งหมดนี้ขอขอบคุณ อาจารย์อวยชัย สุภาพจน์ Some Tricks for accomplishing an ideal end when hand polishing rocks contain cleansing your rocks before polishing, utilizing the proper grits, applying polishing compounds, becoming Mild, and finishing with a higher-gloss polish. Helpful Not Valuable If you might want to form a more durable rock, go with Successfully Submitted (Awaiting Approval)