Here ™s a quick and easy system of making footwear impressions without damaging or contaminating the footwear. Simply press the footwear onto the surface of the BIO-FOAMÂ®, spray on a thin coating of Aerosol Dust & Dirt Hardener (Cat. No. 638CA), and then mix and pour in Shake-N-Cast (No. SNC42) ready-to-use casting material. This makes a permanent impression of the footwear. The high density foam provides extremely fine detail and comes packaged in a selfstoring cardboard container.