The Hobby Time Keramin-S 1Kg Modelling Compound from the Modelling Accessories range provides a high quality moulding material. A similar product to Keramin but with the addition of more ceramic powder and a chemical additive to resist moisture absorption. Ideal for casting items for outside use. Material is a white powder and is mixed in a ratio of 4 parts powder to 1 part water. Depending on size: Working time 10 minutes Setting time 30 minutes Manufacturer: Hobby Time Model: 695011 Keramin-S 1Kg Modelling Compound