Premix manufactures a line a cement plaster base coats in it's P/M Concentrate line. P/M Concentrate is a fiber reinforced grey cement factory blended mixture designed as a cement plaster base coat requiring only the addition of sand and water on the job site. P/M Concentrate WS is a fiber reinforced grey cement factory blended mixture designed as a cement plaster base coat that is complete (the sand is in the mixture) - only water should be added on the job site. P/M Concentrate NF is a grey cement blended mixture designed as a cement plaster base coat requiring the addition of sand, fibers (for crack resistance), and water on the job site.