Color: Off white Weight: 1 lb Fill-It is a sulfur free, off-white, wax based clay with excellent adhesive and feathering characteristics. It is a general use clay used by mold makers to seal mold boxes, build dams, set parting lines/shims and repair cracks. Additional Details ------------------------------ Product description: Color: Off white Weight: 1 lb Fill-It is a sulfur free, off-white, wax based clay with excellent adhesive and feathering characteristics. It is a general use clay used by mold makers to seal mold boxes, build dams, set parting lines/shims and repair cracks.