Tartac 40 Pine tar Sovereign Chemical Plasticizers ADHESIVE High viscosity pine tar. Used as a plasticizer, tackifier, and process aid. Can also be used as replacement for oil when economics or supply warrants. Due to the high acidity, pine tar will retard the cure; this can be offset by adding 3/4 phr of CaO High viscosity pine tar. Used as a plasticizer, tackifier and process aid. Retards the cure.