This type of clay is often used, in conjunction with a filleting ball, to create a temporary smooth radius on the inside corners of patterns before taking a mould off the pattern. The clay is reusable and resins don't stick to it.
POLYMER MODELLING CLAY AIR DRY POLYMER MODELLING CLAY 10kg
DAS 1 Kg Air Drying Modelling Clay Self Hardening Modelling Sculpting Clay - UK
DAS 1 kg Air Drying Modelling Clay Self Hardening Modelling Sculpting Clay - UK
DAS 1 kg Air Drying Modelling Clay Self Hardening Modelling Sculpting Clay UK
76 Colours Air Dry Clay Modelling Clay for Kids DIY Molding Magic Clay Toys
Air Dry Clay for Kids –24 Color Modelling Clay Kit with 5 Clay Tools and Booklet