Sovrez 78 Octyl-phenol formaldehyde novolak Sovereign Chemical Tackifier >> Phenolic ADHESIVE High performance tackifying resin. Best for initial tack and aged tack even after several days of storage under adverse conditions. Will outperform products costing considerably more. Used in race tires, tread cements, splice cements, belts and hoses High performance novolak tackifying resin. Provides very good initial tack and aged tack even after several days of storage under adverse conditions.