Roughening increases the surface area of synthetic fabrics for a better mechanical bond with indirect films and direct emulsions; for better fabric water retention for the adhering of CDF direct-films; and for extended stencil life with any stencil system. The particles in Microgrit No. 2 are fine enough (18-20 microns) to pass through even the smallest mesh openings. Do not use Microgrit No. 2 on natural silk.