Calcium Napthenate (4%)/5.5 The mill base is ground with a 3-roll mill to a fineness of 5-5.5 on the N.S. gauge. Letdown "Kelecin" FB/5 Exkin #2/1 "Cab-O-Sil" M-5/10 Calcium Carbonate/442 Mineral Spirits/25 "Duraplex" D65A/200 Phthalic Alkyd Resin/125 Mineral Spirits/175 Lead Naphthenate (24%)/5 Titanium Dioxide, Enamel Grade (O.A. 19-22)/225 Cobalt Naphthenate (6%)/2.5