Manganese Naphthenate (6%)/1.12 Lead Naphthenate (24%)/3.36 this base is ground in a pebble mill to a fineness of 5.5 on the N.S. gauge. Let-Down "Cab-O-Sil" M-7/33.3 Mineral Spirits/187.0 Polyurethane 101/318.00 Polyurethane 101/127.5 Mineral Spirits/66.50 Cobalt Naphthenate (6%)/1.12