15 min: A third of the polybutene and remainder of calcium carbonate is added. 25 min: Remaining polybutene and half the talc are added. 30 min: Remaining talc, TiO2, and half the solvent are added and the mass mixed until homogeneous. 35 min: Mix cobalt drier and remaining mineral spirits and add the mixture incrementally over a 10 min period. 50 min: Mass should be homogeneous and ready for dumping. Compression ram used 0-35 min. Mixing procedure for "Polysar" XL-50 formulations Start: Steam on to approximately 250'F. add thixotrope. 1 min: Add polybutene, antioxidant and phenolic resin. 5 min: Steam off; incrementally add fillers and pigment. 30 min: Add copolymer incrementally. 50 min: Mix for 5 min. 55 min: Dump.